probe begin 
{
	printf("%1b", 0x12)
	printf("%1b", 0x34)
	printf("%1b%1b", 0x56, 0x78)
	a = 0x12
	b = 0x34
	c = 0x56
	d = 0x78
	printf("%1b%1b%1b%1b", a, b, c, d)
	printf("a=%1b b=%1b c=%1b d=%1b",a,b,c,d)
	exit()
}