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-1 1 0 root node
L 1 3 size attr on root
1 1 0 label on root
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L 5 4 size on l1/n1/l2/n2
5 3 101 n
5 3 0 i
L 1 10 another size attr on root
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5 7 101 n
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5 9 0 i
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5 11 1 i
L 11 5 size
E 27 0 0 unnamed