output for solution Number 2 is
{x1: Array(3), x11: Array(2), x12: Array(1), x2: Array(5), x21: Array(3)โฆ}
x1: Array(3) 0: "100" 1: "101" 2: "1011" x11: Array(2) 0: "101" 1: "1011" x12: Array(1) 0: "1011" x2: Array(5) 0: "100" 1: "201" 2: "2011" 3: "20110" 4: "202" x21: Array(3) 0: "201" 1: "2011" 2: "20110" x22: Array(1) 0: "2011" x23: Array(1) 0: "20110" x32: Array(1) 0: "202" โ