The affine group [4,4], , (p4m), can be given by three reflection matrices, reflections across the x axis (y=0), a diagonal (x=y), and the affine reflection across the line (x=1). [4,4] () (p4) is generated by S 0,1 S 1,2, and S 0,2. [4,4 ] () (pgg) is generated by 2-fold rotation S 0,2 and glide reflection (transreflection) V 0,1,2. [4,4] () (p4g) is generated by S 0,1 and R 3. The group [(4,4,2)] () (cmm), is generated by 2-fold rotation S 1,3 and reflection R 2.