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小灵通切一块上面有7个枣的丝糕,他想只切3刀,就把它切成7块,并且被切出的每小块丝糕上都有一个枣,应该怎样切呢?
PHS cut a jujube above a silk cake, he would like to cut only three knives, put it cut into seven, and was cut out on each small piece of silk cake there is a jujube, how should cut it?