dec a
  jz  DO_SOMETHING
  dec a
  jz  DO_SOMETHING_ELSE
  dec a
  jz  DO_SOMETHING_ELSE  ;do the same for both cases
  dec a
.if NEW_STUFF
  dec a
  jz  DO_THE_NEW_STUFF
.endif
  jz  DO_SOMETHING_DIFFERENT
  dec a
  jz  DO_SOMETHING_MORE