Same wheeze as you see below, but maybe a bit wittier? It's obvious, but not quite as obvious as you think when you first look at it, I hope. 
@_=(6,1,21,3,21,1,0,2,21,11,2,6,24,21,
11,2,24,2,1,18,1,24,10,11,10,2,12,7,15
,12,2);sub _{for(@_){$!=~m{.{$_}(.+?)}
;push@=,+$+}@_=(2,18,24);+$=[8]++;for(
@_){+$=[+$_]++}$=[8]++;+@_=(12,16,21);
for(@_){$=[+$_]++,$=[$_]++,chop$=[+$_]
;if($_==21){$=[$_]++}}for(0..1){$=[13]
++}}grep@_,open 0,0;&_;$=[8]++;print@=

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§ George Sherston

In reply to Another JAEM - by George_Sherston

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