四同:
藍:E 綠:BDHF 橘:AGCI
三同一異:
藍:E 綠:BDHF 橘:AGCI 粗體深綠:因為只有3色,所以只剩1選擇 紅:B,D,H,F擇一作為"一異"
二同二同:
(前面的BDHF、AGCI分類先省略)藍:BDHF顏色相同者不相對 綠:BDHF顏色相同者隔E相對 紅: (BD同,HF同)或(BF同,DH同) X 顏色分配=2 X 2 =4
二同二異:0
附暴力代码证实..
> s:=0:
> for a11 in{1,2,3}do
> for a12 in{1,2,3}minus{a11}do
> for a13 in{1,2,3}minus{a12}do
> for a21 in{1,2,3}minus{a11}do
> for a22 in{1,2,3}minus{a12,a21}do
> for a23 in{1,2,3}minus{a13,a22}do
> for a31 in{1,2,3}minus{a21}do
> for a32 in{1,2,3}minus{a22,a31}do
> for a33 in{1,2,3}minus{a23,a32}do
> s:=s+1 od od od od od od od od od:
> s;
246