Which of the following cannot be the single sock?
At least two of the pairs must be (B,D), (E,A) or (C,H). Therefore, the pairs can be
1) (B,D), (E,A), (C,H), (G,I)... F
2) (B,D), (E,A), (F,C), (G,I)... H
3) (B,D), (C,H), (F,A), (G,I)... E
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