sentences:  However, Edward Powe, a researcher of Nigerian martial art culture recognizes striking similarities in stance and single wrapped fist  of Hausa boxers to images of ancient Egyptian boxers from the 12th and 13th dynasties.It originally started out among the lower class of Hausa Butcher caste groups and later developed into a way of practicing military skills and then  into sporting events through generations of Northern Nigerians.It is fought in rounds of three or less which have no time limits.