CLEAR X
INCREASE X      
INCREASE X       
INCREASE X      

CLEAR F
INCREASE F
INCREASE F
INCREASE F
INCREASE F
INCREASE F
INCREASE F
INCREASE F
INCREASE F
INCREASE F
INCREASE F
INCREASE F
INCREASE F
INCREASE F
INCREASE F
INCREASE F
INCREASE F
INCREASE F
INCREASE F
INCREASE F      

REPEAT F TIMES (
    CLEAR A
    REPEAT X TIMES (
        INCREASE A
    )
    INCREASE A  
    CLEAR X
    REPEAT A TIMES (
        INCREASE X
    )
    PRINT X
)