" " 1 4 1 parse

4 -1 roll

<
|Jan 1
|Feb 2
|Mar 3
|Apr 4
|May 5
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|Jul 7
|Aug 8
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|Nov 11
|Dec 12
> not
{
 1
} if
&"/"
&4)
&"/"
&3)
&" "
^