XXXXXXXXXX
X        X
X XXXXXX X
XEXX     X
XXXX XXXXX
XP       X
XXXXXXXXXX

while (!isend())
{
	if (!iscrumb())
	{
		Dropcrumb;
	}

	Tr;
	while (iswall())
	{
		Tl;
	}

	if (iscrumb())
	{
		PickUpCrumb;
	}
	F;
}