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sed, 12 bytes Print nothing if true; newline if false. /[abipq]/d;x if match, delete and go to next line of input else swap input with empty hold space and print (gives newline)
sed, 12 bytes Print nothing if true; newline if false. /[abipq]/d;x if match, delete and go to next line of input else swap input with empty hold space and print (gives newline)