def mm(a,b):
	ar=len(a)
	ac=len(a[0])
	br=len(b)
	bc=len(b[0])
	if ac!=br:
		raise TypeError
	cr=ar
	cc=bc
	ans=[]
	for y in range(cr):
		ans.append([])
		for x in range(cc):
			ans[y].append(0)
	for rows in range(cr):
		for columns in range(cc):
			for countloop in range(bc):
				ans[rows][columns]+=a[rows][countloop]*b[countloop][columns]
	return ans