letarr=[1,2,3,4];(arr的长度不固定)求[1,2,3,4,12,13,14,23,24,34]
(arr的长度不固定)求[1,2,3,4,12,13,14,23,24,34]
求[1,2,3,4,12,13,14,23,24,34]
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