In molecules, C, H, O, and N atoms usually make __, __, __, and __ bonds respectively.
3, 2, 4, 2
2, 1, 3, 4
3, 2, 1, 4
4, 1, 3, 2
4, 1, 2, 3
The answer is :
4, 1, 2, 3.
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