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my @row = ('col1 : line1 col2 : line2', ... eval($f); write;
col1:line1|col2|col3 f1 col3 f2|col4|col5:line1|col6: line1,line1 col2:line2||||col5:line2|col6:line2,line2 |||||col6:line3,line3 |||||col6:line4,line4