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<?php $i = 7; print_r(range(-floor($i / 2), floor($i / 2) - ($i + 1) % 2)); $i = 3; print_r(range(-floor($i / 2), floor($i / 2) - ($i + 1) % 2)); $i = 4; print_r(range(-floor($i / 2), floor($i / 2) - ($i + 1) % 2)); $i = 7; print_r(range(($i + 1) % 2 - floor($i / 2), floor($i / 2))); $i = 3; print_r(range(($i + 1) % 2 - floor($i / 2), floor($i / 2))); $i = 4; print_r(range(($i + 1) % 2 - floor($i / 2), floor($i / 2)));