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opg. 12 e (1 (2 (3, 4), 3 (4, 2), 4 (3, 2)), 2 (1 (3, 4), 3 (1, 4), 4 (3,…
opg. 12 e
1
2
3
4
3
4
2
4
3
2
2
1
3
4
3
1
4
4
3
1
3
1
2
4
2
1
4
4
1
2
4
1
2
3
2
1
3
3
2
1