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10 OVER 0: INK 0: PAPER 7: BORDER 7: CLS
20 INPUT "Enter 1 - 20 characters"'a$
30 POKE 23692,255
40 LET d=0: LET e=0
50 PRINT AT e,d;a$; INVERSE 1;a$
60 LET e=e+1
70 IF e>20 THEN LET e=-e
80 LET d=d+1
90 IF d>30 THEN LET d=-d
100 GO TO 50