12个数字两两组合一共多少种情况

简介：When Tao Ran saw that something was wrong, he immediately turned around and ran towards the exit. At this time, he wished his parents would give him two more legs. He fell down while running, got up again, and continued running towards the exit, but in While running, Tao Ran's clothes were scratched by the surrounding stones, and there were more and more wounds all over his body.