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Set is 01234567$'\01234567$'\<.
01234567$'\01234567$'\<
for c (${(s..)1})l+="\\$[[##8]#c]" <<<'<<<$'\'$l\'
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Converts each character into \[N]NN octal, evaluated by wrapping the string in $' ' and printed with <<<.
\[N]NN
$' '
<<<
Set is 01234567$'\.
01234567$'\
Set is 01234567$'\<.
01234567$'\<