def multiply$($m$1,$m$2)$:

#first matrix is nxk in size

#second matrix is dxm in size

n $=$ len$($m$1)$

k $=$ len$($m$1[0])$

d $=$ len$($m$2)$

m $=$ len$($m$2[0])$

#check to make sure sizes match

if k $!=$ d:

print$("$ERROR $-$ inner dimensions not equal"$)$

else:

return result