Let a△b and a∇b represent the minimum value and maximum value of the two numbers a and b, for example, 3△4=3, 3∇4=4. Then for different numbers x, how many values are there for 6∇(4∇(x△5)).
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，6∇(4∇(x△5))的取值共有多少个．
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