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28 Alan Alan Zombies
28 Alan Alan Ghosts</pre>
=={{header|plainTeX}}==
Works with any TeX engine.
<lang tex>\newtoks\tabjoin
\def\quark{\quark}
\def\tabA{27:Jonah,18:Alan,28:Glory,18:Popeye,28:Alan}
\def\tabB{Jonah:Whales,Jonah:Spiders,Alan:Ghosts,Alan:Zombies,Glory:Buffy}
\def\mergejoin{\tabjoin{}\expandafter\mergejoini\tabA,\quark:\quark,}
\def\mergejoini#1:#2,{%
\ifx\quark#1\the\tabjoin
\else
\long\def\mergejoinii##1,#2:##2,{%
\ifx\quark##2\else
\tabjoin\expandafter{\the\tabjoin#1 : #2 : ##2\par}%
\expandafter\mergejoinii\expandafter,%
\fi
}%
\expandafter\mergejoinii\expandafter,\tabB,#2:\quark,%
\expandafter\mergejoini
\fi
}
\mergejoin
\bye</lang>
pdf or dvi output:
<pre>27 : Jonah : Whales
27 : Jonah : Spiders
18 : Alan : Ghosts
18 : Alan : Zombies
28 : Glory : Buffy
28 : Alan : Ghosts
28 : Alan : Zombies</pre>
=={{header|Python}}==
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