\documentclass[10pt,a4paper]{article}

% Packages
\usepackage{fancyhdr}           % For header and footer
\usepackage{multicol}           % Allows multicols in tables
\usepackage{tabularx}           % Intelligent column widths
\usepackage{tabulary}           % Used in header and footer
\usepackage{hhline}             % Border under tables
\usepackage{graphicx}           % For images
\usepackage{xcolor}             % For hex colours
%\usepackage[utf8x]{inputenc}    % For unicode character support
\usepackage[T1]{fontenc}        % Without this we get weird character replacements
\usepackage{colortbl}           % For coloured tables
\usepackage{setspace}           % For line height
\usepackage{lastpage}           % Needed for total page number
\usepackage{seqsplit}           % Splits long words.
%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
\usepackage[normalem]{ulem}     % For underlining links
% Most of the following are not required for the majority
% of cheat sheets but are needed for some symbol support.
\usepackage{amsmath}            % Symbols
\usepackage{MnSymbol}           % Symbols
\usepackage{wasysym}            % Symbols
%\usepackage[english,german,french,spanish,italian]{babel}              % Languages

% Document Info
\author{mliafol}
\pdfinfo{
  /Title (flink.pdf)
  /Creator (Cheatography)
  /Author (mliafol)
  /Subject (Flink Cheat Sheet)
}

% Lengths and widths
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\setlength{\tabcolsep}{0.2cm} % Space between columns
\setlength{\headsep}{-12pt} % Reduce space between header and content
\setlength{\headheight}{85pt} % If less, LaTeX automatically increases it
\renewcommand{\footrulewidth}{0pt} % Remove footer line
\renewcommand{\headrulewidth}{0pt} % Remove header line
\renewcommand{\seqinsert}{\ifmmode\allowbreak\else\-\fi} % Hyphens in seqsplit
% This two commands together give roughly
% the right line height in the tables
\renewcommand{\arraystretch}{1.3}
\onehalfspacing

% Commands
\newcommand{\SetRowColor}[1]{\noalign{\gdef\RowColorName{#1}}\rowcolor{\RowColorName}} % Shortcut for row colour
\newcommand{\mymulticolumn}[3]{\multicolumn{#1}{>{\columncolor{\RowColorName}}#2}{#3}} % For coloured multi-cols
\newcolumntype{x}[1]{>{\raggedright}p{#1}} % New column types for ragged-right paragraph columns
\newcommand{\tn}{\tabularnewline} % Required as custom column type in use

% Font and Colours
\definecolor{HeadBackground}{HTML}{333333}
\definecolor{FootBackground}{HTML}{666666}
\definecolor{TextColor}{HTML}{333333}
\definecolor{DarkBackground}{HTML}{5FA37A}
\definecolor{LightBackground}{HTML}{F5F9F6}
\renewcommand{\familydefault}{\sfdefault}
\color{TextColor}

% Header and Footer
\pagestyle{fancy}
\fancyhead{} % Set header to blank
\fancyfoot{} % Set footer to blank
\fancyhead[L]{
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
    \SetRowColor{DarkBackground}
    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
    }
\end{tabulary}
\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Flink Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{mliafol} via \textcolor{DarkBackground}{\uline{cheatography.com/70309/cs/39328/}}}
\end{tabulary}
\end{multicols}}

\fancyfoot[L]{ \footnotesize
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}mliafol \\
  \uline{cheatography.com/mliafol} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Not Yet Published.\\
   Updated 29th November, 2023.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
  \SetRowColor{white}
  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
\raggedright
\raggedcolumns

% Set font size to small. Switch to any value
% from this page to resize cheat sheet text:
% www.emerson.emory.edu/services/latex/latex_169.html
\footnotesize % Small font.


\begin{tabularx}{17.67cm}{x{8.635 cm} x{8.635 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{17.67cm}}{\bf\textcolor{white}{Flink's API}}  \tn
% Row 0
\SetRowColor{LightBackground}
SQL & Highlevel Language \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
Table API & Declarative DSL \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
DataStream/DataSet API & Core API \tn 
% Row Count 4 (+ 2)
% Row 3
\SetRowColor{white}
Stateful Stream Processing & Lower level building block \tn 
% Row Count 6 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{7.2534 cm} x{10.0166 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{17.67cm}}{\bf\textcolor{white}{DataSream}}  \tn
% Row 0
\SetRowColor{LightBackground}
Data Stream & Immutable collections of data that can contain duplicates, can either be finite or unbounded \tn 
% Row Count 4 (+ 4)
% Row 1
\SetRowColor{white}
Flink program & Obtain en execution environment \tn 
% Row Count 6 (+ 2)
% Row 2
\SetRowColor{LightBackground}
 & Load/create the initial data \tn 
% Row Count 8 (+ 2)
% Row 3
\SetRowColor{white}
 & Transformation \tn 
% Row Count 9 (+ 1)
% Row 4
\SetRowColor{LightBackground}
 & Where to put the result \tn 
% Row Count 10 (+ 1)
% Row 5
\SetRowColor{white}
 & Trigger the execution \tn 
% Row Count 11 (+ 1)
% Row 6
\SetRowColor{LightBackground}
Flink program executed lazily & do not happen directly. Rather, operation is created and added to dataflow graph \tn 
% Row Count 15 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{4.2175 cm} x{6.2419 cm} x{6.4106 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{3}{x{17.67cm}}{\bf\textcolor{white}{Datasource Overview}}  \tn
% Row 0
\SetRowColor{LightBackground}
\seqsplit{StreamExecutionEnvironment} & \seqsplit{getExecutionEnvironment();} &  \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
Filebase \seqsplit{datasources} & \seqsplit{env.readFile(fileInputFormat}, path, watchType, interval, pathFilter, typeInfo) & watchType: can be \seqsplit{ileProcessingMode}.PROCESS\_CONTINUOUSLY or \seqsplit{FileProcessingMode}.PROCESS\_ONCE \tn 
% Row Count 10 (+ 7)
% Row 2
\SetRowColor{LightBackground}
\seqsplit{Socket-based:} & \seqsplit{env.socketTextStream} &  \tn 
% Row Count 12 (+ 2)
% Row 3
\SetRowColor{white}
\seqsplit{Collection} based & env. \seqsplit{fromCollection}, \seqsplit{env.fromElements} &  \tn 
% Row Count 15 (+ 3)
% Row 4
\SetRowColor{LightBackground}
Custom source & env.addSource &  \tn 
% Row Count 17 (+ 2)
% Row 5
\SetRowColor{white}
A sequence numbers & \seqsplit{env.generateSequence(0}, 1000) &  \tn 
% Row Count 20 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}---}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{8.635 cm} x{8.635 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{17.67cm}}{\bf\textcolor{white}{Data sink overview}}  \tn
% Row 0
\SetRowColor{LightBackground}
writeAsText() / TextOutputFormat & Writes elements line-wise as Strings. \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
writeAsCsv() / CsvOutputFormat & Writes tuples as comma-separated value files. \tn 
% Row Count 5 (+ 3)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{17.67cm}}{print() / printToErr()} \tn 
% Row Count 6 (+ 1)
% Row 3
\SetRowColor{white}
\seqsplit{writeUsingOutputFormat()} / FileOutputFormat & Method and base class for custom file outputs \tn 
% Row Count 9 (+ 3)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{17.67cm}}{writeToSocket} \tn 
% Row Count 10 (+ 1)
% Row 5
\SetRowColor{white}
\mymulticolumn{2}{x{17.67cm}}{addSink} \tn 
% Row Count 11 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{8.635 cm} x{8.635 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{17.67cm}}{\bf\textcolor{white}{Timely Stream processing}}  \tn
% Row 0
\SetRowColor{LightBackground}
Processing time & {\bf{System time of the machine that is executing the respective operation}} \tn 
% Row Count 4 (+ 4)
% Row 1
\SetRowColor{white}
 & No coordination between streams and machines \tn 
% Row Count 7 (+ 3)
% Row 2
\SetRowColor{LightBackground}
 & Best performance and lowest latency \tn 
% Row Count 9 (+ 2)
% Row 3
\SetRowColor{white}
 & Not provide determinism in distributed and async enviroments \tn 
% Row Count 12 (+ 3)
% Row 4
\SetRowColor{LightBackground}
Event time & {\bf{The time that each individual event occurred on its producing device}} \tn 
% Row Count 16 (+ 4)
% Row 5
\SetRowColor{white}
 & Extract from the records \tn 
% Row Count 18 (+ 2)
% Row 6
\SetRowColor{LightBackground}
 & Consistent and deterministic \tn 
% Row Count 20 (+ 2)
% Row 7
\SetRowColor{white}
 & High latency while waiting for out-of-order events \tn 
% Row Count 23 (+ 3)
% Row 8
\SetRowColor{LightBackground}
Watermark & {\bf{A mechanism to measure progress in event time}} \tn 
% Row Count 26 (+ 3)
% Row 9
\SetRowColor{white}
 & Flow as part of the data stream and carry a timestamp t \tn 
% Row Count 29 (+ 3)
% Row 10
\SetRowColor{LightBackground}
 & Watermark(t) declares that event time has reached time t, there should be no more elements with timestamp \textless{}= t \tn 
% Row Count 35 (+ 6)
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{8.635 cm} x{8.635 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{17.67cm}}{\bf\textcolor{white}{Timely Stream processing (cont)}}  \tn
% Row 11
\SetRowColor{LightBackground}
 & Crucial for out-of-order streams \tn 
% Row Count 2 (+ 2)
% Row 12
\SetRowColor{white}
Watermark strategy & TimestampAssigner + WatermarkGenerator \tn 
% Row Count 4 (+ 2)
% Row 13
\SetRowColor{LightBackground}
WatermarkGenerator & onEvent: Called for every event \tn 
% Row Count 6 (+ 2)
% Row 14
\SetRowColor{white}
 & onPeriodicEmit: call periodically, and might emit a new watermark or not \tn 
% Row Count 10 (+ 4)
% Row 15
\SetRowColor{LightBackground}
 & punctuate or periodic \tn 
% Row Count 12 (+ 2)
% Row 16
\SetRowColor{white}
\seqsplit{WatermarkStrategy.forMonotonousTimestamps();} & Event time itself \tn 
% Row Count 15 (+ 3)
% Row 17
\SetRowColor{LightBackground}
\seqsplit{WatermarkStrategy.forBoundedOutOfOrderness} & Watermark lags behind the maximum timestamp seen in the stream by a fixed amount of time \tn 
% Row Count 20 (+ 5)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{6.3899 cm} x{10.8801 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{17.67cm}}{\bf\textcolor{white}{State}}  \tn
% Row 0
\SetRowColor{LightBackground}
Stateful operator & Remember information acc \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
Keyed state & Embedded key/value store \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
 & Partitioned and distributed strictly together with the streams \tn 
% Row Count 6 (+ 3)
% Row 3
\SetRowColor{white}
 & Only on keyed stream \tn 
% Row Count 7 (+ 1)
% Row 4
\SetRowColor{LightBackground}
State persistence & Fault tolerance: stream replay and checkpointing \tn 
% Row Count 9 (+ 2)
% Row 5
\SetRowColor{white}
Checkpoint & Marks a specific point in each of the input streams along with the corresponding state for each operators \tn 
% Row Count 14 (+ 5)
% Row 6
\SetRowColor{LightBackground}
 & Drawing consistent snapshots of the distributed data stream and operator state \tn 
% Row Count 18 (+ 4)
% Row 7
\SetRowColor{white}
Stream barriers & Injected into the data stream and flow with the records as part of the data stream \tn 
% Row Count 22 (+ 4)
% Row 8
\SetRowColor{LightBackground}
 & Separated the records in the data stream into the set of records that goes into the current snapshot, and the records that go into the next snapshot. \tn 
% Row Count 28 (+ 6)
% Row 9
\SetRowColor{white}
 & The point where the barriers for snapshot n are injected, is the position in the source stream up to which snapshot cover the data \tn 
% Row Count 34 (+ 6)
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{6.3899 cm} x{10.8801 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{17.67cm}}{\bf\textcolor{white}{State (cont)}}  \tn
% Row 10
\SetRowColor{LightBackground}
 & Alignment phrase: Receive barrier for snapshot n of one incoming stream, operator need to wait until receive all others input \tn 
% Row Count 5 (+ 5)
% Row 11
\SetRowColor{white}
Snapshot operator state & At the point in time when they received all barriers from input streams and before emitting the barriers to their output streams \tn 
% Row Count 11 (+ 6)
% Row 12
\SetRowColor{LightBackground}
 & For each parallel stream data source, the offset/position in the stream when  the snapshot started \tn 
% Row Count 15 (+ 4)
% Row 13
\SetRowColor{white}
 & For each operator, a pointer to the state that was stored \tn 
% Row Count 18 (+ 3)
% Row 14
\SetRowColor{LightBackground}
Unaligned checkpoint & Reacts on the first barrier that is stored in its input buffers \tn 
% Row Count 21 (+ 3)
% Row 15
\SetRowColor{white}
Checkpoint & Simple external dependencies \tn 
% Row Count 23 (+ 2)
% Row 16
\SetRowColor{LightBackground}
 & Immutable and versioned \tn 
% Row Count 24 (+ 1)
% Row 17
\SetRowColor{white}
 & Decouple the stream transport from the persistence mechanism \tn 
% Row Count 27 (+ 3)
% Row 18
\SetRowColor{LightBackground}
Backpressure & Slow receiver makes the senders slow down in order not to overwhelm the receiver \tn 
% Row Count 31 (+ 4)
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{6.3899 cm} x{10.8801 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{17.67cm}}{\bf\textcolor{white}{State (cont)}}  \tn
% Row 19
\SetRowColor{LightBackground}
Snapshot & generic term refer to global, consistent image of a state of a Flink job \tn 
% Row Count 3 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{17.67cm}}{\bf\textcolor{white}{Flink architecture}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{p{17.67cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/mliafol_1697183640_Screenshot 2023-10-13 at 3.53.21 PM.png}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{17.67cm}}{The client is not part of the runtime and program execution, but is used to prepare and send a dataflow to the JobManager. After that, client can disconnect(detached mode), or stay connected (attached mode)}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{6.3899 cm} x{10.8801 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{17.67cm}}{\bf\textcolor{white}{RocksDB tunning}}  \tn
% Row 0
\SetRowColor{LightBackground}
Incremental checkpoints & Record the changes compared to the previous completed checkpoint, instead of producing a full, self-contained backup \tn 
% Row Count 5 (+ 5)
% Row 1
\SetRowColor{white}
Timers & Schedule actions for later  =\textgreater{} save on healp =\textgreater{} \tn 
% Row Count 7 (+ 2)
% Row 2
\SetRowColor{LightBackground}
 & \seqsplit{state.backend.rocksdb.timer-service.factory} =heap \tn 
% Row Count 9 (+ 2)
% Row 3
\SetRowColor{white}
Tunning rocksdb memory & Flink's managed memory to buffer and cache \tn 
% Row Count 11 (+ 2)
% Row 4
\SetRowColor{LightBackground}
 & Increase the amount of managed memory \tn 
% Row Count 13 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{5.8718 cm} x{11.3982 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{17.67cm}}{\bf\textcolor{white}{Window}}  \tn
% Row 0
\SetRowColor{LightBackground}
{\bf{Definition}} & Split stream into buckets of finite size, over which we can apply computations \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
{\bf{Keyed windows}} & .keyBy().window().{[}.triger(){]}{[}.evictor(){]}{[}.allowedLateness(){]}{[}.sideOutputLateData(){]}.reduce/aggregate/apply \tn 
% Row Count 8 (+ 5)
% Row 2
\SetRowColor{LightBackground}
 & Be performed in parallel by multiple tasks \tn 
% Row Count 10 (+ 2)
% Row 3
\SetRowColor{white}
{\bf{Non-Keyed windows}} & windowAll().{[}.triger(){]}{[}.evictor(){]}{[}.allowedLateness(){]}{[}.sideOutputLateData(){]}.reduce/aggregate/apply \tn 
% Row Count 14 (+ 4)
% Row 4
\SetRowColor{LightBackground}
 & Be performed by a single task (parallelism = 1) \tn 
% Row Count 16 (+ 2)
% Row 5
\SetRowColor{white}
{\bf{Lifecycle}} & Created : the first element belong to this window arrie \tn 
% Row Count 19 (+ 3)
% Row 6
\SetRowColor{LightBackground}
 & Removed: the time passes its end timestamp + allowed lateness \tn 
% Row Count 22 (+ 3)
% Row 7
\SetRowColor{white}
{\bf{Window Assigner}} & Responsible for assigning each incoming element to 1 or more windows \tn 
% Row Count 25 (+ 3)
% Row 8
\SetRowColor{LightBackground}
 & Assign based on time: start timestamp (inclusive) and an end timestime(exclusive) \tn 
% Row Count 29 (+ 4)
% Row 9
\SetRowColor{white}
 & TumblingWindows: each element to {\bf{a window}} of a specified window size. {\bf{Fixed size and not overlap}} \tn 
% Row Count 33 (+ 4)
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{5.8718 cm} x{11.3982 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{17.67cm}}{\bf\textcolor{white}{Window (cont)}}  \tn
% Row 10
\SetRowColor{LightBackground}
 & SlidingWindows: each element to {\bf{windows}}. {\bf{Fixed size and can be overlapping }}(window slide \textless{} window size) \tn 
% Row Count 5 (+ 5)
% Row 11
\SetRowColor{white}
 & SessionWindows: assigner groups elements by {\bf{sessions of activity}}. Dont overlap, dont have fixed time. Close when it does not receive elements for a certain period of time \tn 
% Row Count 12 (+ 7)
% Row 12
\SetRowColor{LightBackground}
 & GlobalWindows: all elements with the same key to {\bf{same global window}}. Only useful if specify a custom trigger, because it does not have a natural end \tn 
% Row Count 18 (+ 6)
% Row 13
\SetRowColor{white}
{\bf{Window Functions}} & Computation that perform on each of windows \tn 
% Row Count 20 (+ 2)
% Row 14
\SetRowColor{LightBackground}
\seqsplit{ReduceFunction} & Incrementally aggregate \tn 
% Row Count 22 (+ 2)
% Row 15
\SetRowColor{white}
 & Two elements from the input are combined to produce an output element with the same type \tn 
% Row Count 26 (+ 4)
% Row 16
\SetRowColor{LightBackground}
\seqsplit{AggregateFunction} & Generalised version of a ReduceFunction with 3 types: IN, ACC, OUT \tn 
% Row Count 29 (+ 3)
% Row 17
\SetRowColor{white}
 & Methods: creating initial accumulator, merging, extract output \tn 
% Row Count 32 (+ 3)
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{5.8718 cm} x{11.3982 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{17.67cm}}{\bf\textcolor{white}{Window (cont)}}  \tn
% Row 18
\SetRowColor{LightBackground}
\seqsplit{ProcessWindowFunction} & Iterable containing all the elements of the window \tn 
% Row Count 2 (+ 2)
% Row 19
\SetRowColor{white}
 & Context object with time and state information \tn 
% Row Count 4 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}



\end{document}