12 is incorrect, as is 23.

See: but some intervals can remain empty like 18-18 or 21-22

So it seems the boundaries are excluded.

s$$([},&%#}/&/]+}%&{})*;#$&&s&&$^X.($'^"%]=\&(|?*{%
+.+=%;.#_}\&"^"-+%*).}%:##%}={~=~:.")&e&&s""`$''`"e

In reply to Re^2: hashing intervals by Skeeve
in thread hashing intervals by baxy77bax

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