<?php return [ [ null, 1, 1, '', ], [ '', 1, 1, '', ], [ 'QWERTYUIOP', -1, 1, '#VALUE!', ], [ 'QWERTYUIOP', 5, -1, '#VALUE!', ], [ 'QWERTYUIOP', 5, '', ], [ 'QWERTYUIOP', 8, 20, 'IOP', ], [ 'ABCDEFGHI', 4, 3, 'DEF', ], [ true, 2, 1, 'R', ], [ false, 2, 2, 'AL', ], ];