a=({0..9} {a..z} \ ) for((n=64;b=b<2?m=--n:b-!m,n+m>2;m=m?m/b:n)){ s=${a[m%b+!m*36+1/b]- }$s;};echo "$s"
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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