+array (0, 10) [(0, 'a'), (1, 'b'), (2, 'c'), (3, 'd'), (4, 'e'), (5, 'f'), (6, 'g'), (7, 'h'), (8, 'i'), (9, 'j'), (10, 'k')]
+array (0, 10) [(0, 'A'), (1, 'B'), (2, 'C'), (3, 'D'), (4, 'E'), (5, 'F'), (6, 'G'), (7, 'H'), (8, 'I'), (9, 'J'), (10, 'K')]
+array (3, 8) [(3, 'e'), (4, 'f'), (5, 'g'), (6, 'h'), (7, 'i'), (8, 'j')]