|   O---+---Rx  
LOOP	20	NREPS=	2
|   O---Ry  |   
    LOOP	10	NREPS=	4
@---R   |   |   
    NEXT	10
|   O---Ry  |   
NEXT	20
|   O---+---Rx  
|   |   Rx  |   
