Change the location of subroutines in the program.

Also, if you are comparing bytes to words (or the other way), just compare the low.byte of the words.

Also, if you are using AND, OR etc in the IF condition, remove them and use separate IF condition for each AND or OR.

Also, if you are using an IF condition similar to the one as follows,
IF a+b = c THEN x=y.
Change it to something like
temp = a+b
IF temp = c THEN x =y

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