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LDA #0
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STA $F0 ; LOWER NUMBER
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LDA #1
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STA $F1 ; HIGHER NUMBER
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LDX #0
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LOOP: LDA $F1
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STA $0F1B,X
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STA $F2 ; OLD HIGHER NUMBER
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ADC $F0
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STA $F1 ; NEW HIGHER NUMBER
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LDA $F2
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STA $F0 ; NEW LOWER NUMBER
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INX
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CPX #$0A ; STOP AT FIB(10)
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BMI LOOP
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RTS ; RETURN FROM SUBROUTINE
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