a 4 × 4-BN; b Inverse 4 × 4-BN; c 4 × 4-B²BN and d 4 × 4-B²BN example ...

a 4 × 4-BN; b Inverse 4 × 4-BN; c 4 × 4-B²BN and d 4 × 4-B²BN example ...