NOTA	testing embedded loops feature of class SEO_simulator. 14 ops
SIGX	AT	2
SIGX	AT	0	IF	2T
SIGX	AT	2
LOOP	20	NREPS=	2
    SIGX	AT	2
    SIGX	AT	1	IF	2T
    SIGX	AT	2
    LOOP	10	NREPS=	4
        SIGX	AT	2	IF	3T
    NEXT	10
    SIGX	AT	2
    SIGX	AT	1	IF	2T
    SIGX	AT	2
NEXT	20
SIGX	AT	2
SIGX	AT	0	IF	2T
SIGX	AT	2
SIGX	AT	1
