push 1; stack is not full
push 2; stack is not full
push 3; stack is not full
push 4; stack is not full
push 5; stack is not full
push 6; stack is not full
push 7; stack is not full
push 9; stack is not full
peeked at 9
popped 9
cleared odd part of stack
stack reports no odd value to pop
peeked at 6