投：暑假演唱会分组！避开五一的分组，避开67一起，分组就这几个了！(6,1)(2,3)[4,5,7]｜(7,4)(2,5)[1,3,6](6,1)(2,4)[3,5,7]｜(7,3)(1,5)[2,4,6](6,1)(2,5)[3,4,7]｜(7,3)(1,4)[2,5,6]