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while ($len--) {
    $H[int($len/4)] += $k[$len] << (8 * ($len % 4));
}

---
print map { my ($m)=1<<hex($_)&11?' ':'';
$m.=substr('AHJPacehklnorstu',hex($_),1) }
split //,'2fde0abe76c36c914586c';