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x1 = []; y1 = []; x2 = []; y2 = []; z = []
i = 0; k = -1
nullnullPlease Wait...
[["1"], ["2"], [nil, "1"], [nil, "2"], [nil, "3"], [nil, nil, "3"]]
[["2"], ["3"], [nil, "2"], [nil, "2"], [nil, "3"], [nil, nil, "4"]]
[["3"], ["4"], [nil, "3"], [nil, "2"], [nil, "3"], [nil, nil, "5"]]
[["4"], ["5"], [nil, "4"], [nil, "2"], [nil, "3"], [nil, nil, "6"]]
[["5"], ["6"], [nil, "5"], [nil, "2"], [nil, "3"], [nil, nil, "7"]]
