Let a△b and a▽b represent the minimum and maximum values of the two numbers a and b, for example, 3△4=3, 3▽4=4, then for different numbers x, 5▽(4▽ (x△4)) how many values are there?
设a△b和a▽b分别表示取a和b两个数的最小值和最大值，如，3△4=3，3▽4=4，那么对于不同的数x，5▽(4▽(x△4))的取值共有多少个．
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