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atom_codespart by using the backquotes which delimit string codes (so you could replace directly L in the call ofbwith the string). \$\endgroup\$b([A,_|T],[H]):-A=H,writef('%s',[T]);b(T,[H]).instead of 2 different rules forbis 7 bytes shorter. Usually, it's always shorter to merge all rules into a single one with ORs;instead of writing multiple rules, because you avoid repeating the predicate's name and parameters and you avoid a linefeed too ;) \$\endgroup\$