来师傅指导一下！后处理怎么去掉G21还有带括号的行

%
O0000
(PROGRAM NAME - 111)
(DATE=DD-MM-YY - 29-08-14 TIME=HH:MM - 12:24)
G21
G0G17G40G49G80G90
(TOOL - 1 DIA. OFF. - 1 LEN. - 1 DIA. - 8.)
G0G90G54X-9.272Y-9.272A0.S6000M3
G43H1Z20.
Z0.
G1X-9.441Y-9.099F3000.
G2X9.441Y9.099R13.112
X-9.272Y-9.272R13.112
G1X-9.273Y-9.273Z-.002
X-9.373Y-9.371Z-.081
X-9.465Y-9.462Z-.175
X-9.487Y-9.483Z-.2
G2X9.485Y9.485R13.414
X-9.485Y-9.485R13.414
G1X-9.487Y-9.483
X-9.489Y-9.485Z-.203
X-9.569Y-9.563Z-.313
X-9.621Y-9.614Z-.4
G2X9.618Y9.618R13.601
X-9.618Y-9.618R13.601
G1X-9.621Y-9.614
X-9.623Y-9.617Z-.405
X-9.69Y-9.682Z-.545