8
insert into t1 (a) values (' '), ('a'), ('b'), ('c'), ('d'), ('e'), ('f'), ('g'), ('h'), ('i'), ('j'), ('k'), ('l'), ('m'), ('n'), ('o'), ('p'), ('q'), ('r'), ('s'), ('t'), ('u'), ('v'), ('w'), ('x'), ('y'), ('z'), ('A'), ('B'), ('C'), ('D'), ('E'), ('F'), ('G'), ('H'), ('I'), ('J'), ('K'), ('L'), ('M'), ('N'), ('O'), ('P'), ('Q'), ('R'), ('S'), ('T'), ('U'), ('V'), ('W'), ('X'), ('Y'), ('Z'), ('!'), ('@'), ('#'), ('$'), ('%'), ('^'), ('&'), ('*'), ('('), (')'), ('_'), ('+'), ('`'), ('~'), ('1'), ('2'), ('3'), ('4'), ('5'), ('6'), ('7'), ('8'), ('9'), ('0'), ('['), (']'), ('\\'), ('|'), ('}'), ('{'), ('"'), (':'), (''''), (';'), ('/'), ('.'), (','), ('?'), ('>'), ('<'), ('\n'), ('\t'), ('\a'), ('\f'), ('\v');