问题:
A . s=<{2,4},{3,5,6},{8}>,t=<{2},{3,6},{8}>B . s=<{2,4},{3,5,6},{8}>,t=<{2},{8}>C . s=<{1,2},{3,4}>,t=<{1},{2}>D . s=<{2,4},{2,4}>,t=<{2},{4}>
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