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DECR key ×Ô¼o¼uÖµ
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LLEN key
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RPOP key µ¯³o List µÄ×iºoÒ»¸oÔªËØ
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SINTER key1 key2 ¡­ keyN
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key2 = c
key3 = a,d
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SMEMBERS key µ»Øij¸oÐoÁеÄËuÓÐÔªËØ
SRANDMEMBER key Ëae»u
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