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persistable sclass ArrayMatrix extends AbstractMatrix { A[] data; *(int *w, int *h) { data = new A[w*h]; } *(int *w, int *h, A[] *data) {} public A get(int x, int y) { ret data[y*w+x]; } public void set(int x, int y, A a) { data[y*w+x] = a; } }