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my %data; while (<DATA>) { ... chr2 120 123 X X - chr3 125 130 X X - chr3 131 132 X X -
ID_1 chr1 101 111 3 ID_2 chr1 112 113 1 ... ID_2 chr2 119 123 2 ID_1 chr3 125 130 1 ID_2 chr3 131 132 1