perfect square free by GeoJ

:
s/.\?/&0&1&2&3&4&5&6&7&8&9/g
T
s/.*020/[/
T
s/../&, /g
s/ 0/ /g
s/ \(8*16*\|6*49*\|9\|25\|36\),//g
s/..$/]/

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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