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10 REM "Draw a parable" 20 REM "" 100 PRINT "Y=X*X" 110 FOR X=-8 TO 8 120 IF X<>0 PRINT "!"; 130 IF X=0 PRINT "+";: FOR I=2 TO 8*8/2: PRINT "-";: NEXT: PRINT : GOTO 160 140 TAB(X*X/2-1) 150 PRINT "*" 160 NEXT X 200 END
