t=---+---+--- t="1|9|4 $t 7|2|9 $t 5|6|3 " for i in {1..7};{ t=${t/$i/ $[i%2] } tr 01 OX<<<"${t//[2-9]/ }" }

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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