10 LINE INPUT "Type an expression: ",A$
20 OPEN "CHAIN.TMP" FOR OUTPUT AS #1
30 PRINT #1, "70 LET Y=("+A$+")"
40 CLOSE #1
50 CHAIN MERGE "CHAIN.TMP",60,ALL
60 FOR X=0 TO 5
70 REM
80 PRINT X,Y
90 NEXT X
100 GOTO 10