0+5=?, 5, 4, 3+0=?, 0, 3, 6+0=?, 6, 0, 0+22=?, 22, 23, 0+15=?, 55, 0, 0+10=?, 88, 10, 0+2=?, 2, 6, 0+67=?, 67, 77, 7 turtles swim no turtles join them how many turtles are there now ?, 0, 7.

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恢復自動保存: ?