II$.$ WHAT IS OUTPUT BY THE FOLLOWING SEGMENT OF CODE?

CLEARSTACK$($STACK$)$;

PUSH$($STACK$,1)$;

WHILE NOT EMPTYSTACK$($STACK$)$ DO

POP$($STACK $,$ N$)$;

Write$($N$)$;

IF N $<=9$

PUSH$($STACK$,2*$N$)$;

PUSH$($STACK$,$ N$+1)$;

ENDIF

ENDWHILE