10 RECORD A1$(42) 
11 Z1=42
15 DIM N(6),T(6,1)
20 RECORD X(128)
63 M4=1\M8=0
65 PRINT "ENTER NAME OF INPUT FILE";
70 LINPUT F$
71 PRINT "ENTER NAME OF OUTPUT DATA FILE";
72 LINPUT F4$ 
73 OPEN 9,F4$ 
80 OPEN 8,F$
85 PRINT "ENTER TOTAL NO. OF ITEMS ON SHEET"; 
90 INPUT N1 
95 PRINT "ENTER NO. OF ITEMS SKIPPED AT TOP OF SHEET";
100 INPUT N2 
105 PRINT "ENTER NO. OF ITEMS SKIPPED AT BOTTOM OF SHEET"; 
110 INPUT N3 
115 PRINT "IS DATA IN FORM 'A' OR FORM 'B'"; 
117 RESTORE
118 FOR I=0 TO 6\READ T(I,0)\NEXT I
120 LINPUT Z$
125 FOR I=0 TO 6\READ T(I,1)\NEXT I
127 IF Z$="A" THEN 140 
129 IF Z$<>"B" THEN 115
130 FOR I=0 TO 6\READ T(I,1)\NEXT I
135 GO TO 115
140 T1=TIM(6)\T2=TIM(0)
142 C=7
145 K=N1+1 
150 X1=N1-N2-N3
155 X2=X1/2
160 GO SUB 500 
163 IF E=1 THEN 250
165 IF N(C)=9 THEN 220 
170 K=K-1
175 IF K>N1-N3 THEN 160
180 IF K<=N2 THEN 160
185 IF INT(K/2)=K/2 THEN 205   
190 X(X2)=N(C) 
195 X2=X2-1
200 GOTO 160 
205 X(X1)=N(C) 
210 X1=X1-1
215 GO TO 160
220 PUT 9,20,M4
223 PRINT "RECORD";M4-1;"CPU=";TIM(0)-T2;"SEC."
225 GO TO 145
250 X(1)=N1-N2-N3
255 X(2)=M4-1
260 M4=0 
265 PUT 9,20,M4
266 PRINT "CPU TIME USED";TIM(0)-T2;"SECONDS"
267 PRINT"ELAPSED TIME";TIM(6)-T1;"MINUTES"
270 STOP 
500 IF C<6 THEN 690
505 GOSUB 800
510 IF A$="EOF" THEN 700 
515 CHANGE A$ TO N 
518 C=1
520 FOR I=1 TO 6 
530 FOR J=0 TO 6 
540 IF N(I)=T(J,0) THEN 580
550 NEXT J 
560 N(I)=0 
570 GOTO 590 
580 N(I)=T(J,1)
590 NEXT I 
600 RETURN 
690 C=C+1
695 RETURN 
700 E=1
705 RETURN 
800 IF Z1=42 GO TO 850 
810 Z1=Z1+1
820 A$=A1$(Z1) 
830 RETURN 
850 GET 8,10,M8
860 Z1=0 
870 GO TO 820
875 DATA 0,64,65,67,71,79,76,0,5,4,3,2,1,9,1,0,5,4,3,2,9 
880 END