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if ($cache_ref->{Index}[$i] eq $fromto_digest || ref->{Index}[$i] eq $
+tofrom_digest)
{
...
    $index_match=1;
    last;
}

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