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int w[2][2]; f () { int i, j; for (i = 0; i < 2; i++) for (j = 0; j < 2; j++) if (i == j) w[i][j] = 1; } main () { f (); if (w[0][0] != 1 || w[1][1] != 1 || w[1][0] != 0 || w[0][1] != 0) abort (); exit (0); }