题目194：图形着色
Coloured ConfigurationsConsider graphs built with the units A: and B:, where the units are glued along the vertical edges as in the graph.
A configuration of type (a,b,c) is a graph thus built of a units A and b units B, where the graph's vertices are coloured using up to c colours, so that no two adjacent vertices have the same colour.
The compound graph above is an example of a configuration of type (2,2,6), in fact of type (2,2,c) for all c ≥ 4.
Let N(a,b,c) be the number of configurations of type (a,b,c).
For example, N(1,0,3) = 24, N(0,2,4) = 92928 and N(2,2,3) = 20736.
Find the last 8 digits of N(25,75,1984).
题目：
考虑由单元 A：和单元 B：相连（将竖直边相连接）组成的图。比如。
我们定义类型为 (a,b,c) 图形为 a 个单元 A 和 b 个单元B组成，并且最多只使用 c 种颜色的图形，同时要求相邻的两个结点颜色不能相同。
上述的图形就是 (2,2,6) 型的，当然也是(2,2,c) ，c ≥ 4 的一个例子。
定义 N(a,b,c) 为 (a,b,c) 型图形的个数。
比如，N(1,0,3) = 24，N(0,2,4) = 92928 还有 N(2,2,3) = 20736。
请给出 N(25,75,1984) 的最后 8 位数字。
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