input: 00100 11110 10110 10111 10101 01111 00111 11100 10000 11001 00010 01010
code: void main() {foreach(line; File("input.txt").byLine.map!(a=>a.idup).array.transposed){
auto sortgroup = line.array.strip.sort.group.assocArray; writeln(sortgroup); } } output: ['1':7, '0':5] ['1':5, '0':7] ['1':8, '0':4] ['1':7, '0':5] ['1':5, '0':7] [] so why there is a [] at the end of assocArray printed? thanks.