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{+/2!0N 2#0,x^"_"}
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{ } function with argument x
{
}
x
x^"_" remove all _s
x^"_"
_
0, prepend a 0
0,
0
0N 2# split in pairs
0N 2#
2! mod 2 (asas ascii codes): P→80→0, o→111→1, ~→126→0
2!
P
o
~
+/ sum
+/
2! mod 2 (as ascii codes)
2! mod 2 as ascii codes: P→80→0, o→111→1, ~→126→0
{$[~2=#x:"P"\x^"_";`error;|//^x:2#',+/2!0N 2#/:"o~"?x;`error;+/x]2#0,x^"_"}
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{$[~2=#x:"P"\x^"_";`error;|//^x:2#',/0N 2#/:"o~"?x;`error;+/x]}
{$[|$[~2=#x:"P"\x^"_";`error;|//^r^x:2#',/0N 2#/:2^"o~""o~"?"P"\x^"_";`error;+x;`error;+/r]x]}
{$[|//^r:2#',/0N 2#/:2^"o~"?"P"\x^"_";`error;+/r]}
