多次元配列の作成と値の読出し
二つの二次元配列
まず２次元配列を二つ用意。
列数、行数が異なっても良い。
二つの配列を結合する
２次元配列を配列で結合、３次元化する
3次元化された二つの配列
読出しは、２次元の添え字で１次元の配列が読み出され、３次元の添え字で値が読み出される。
2次元添え字で1次元配列を読み出し、3次元添え字で値を直接読み出す
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