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sub readprompt {
  my $prompt = shift;
...
while (my $i=readprompt(">>")) {
  print "You said: $i\n";
}

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