 lines. Every collinear dot on BC can be paired with a single dot on CD. It contributes $0\times 0=0$  lines. Every collinear dot on BC can be paired with  a single dot on AB. It contributes $0\times 0=0$  lines. Every collinear dot on AD can be paired with  a single dot on CD. It contributes $0\times 0=0$  lines. Every collinear dot on AD can be paired with  a single dot on AB. It contributes $0\times 0=0$  lines. 