### Matrix for z(4,4 | 4,4)

$I$ | $I$ | $I$ | $I$ |

$I$ | $\alpha$ | $\beta$ | $\alpha\beta$ |

$I$ | $\beta$ | $\alpha\beta$ | $\alpha$ |

$I$ | $\alpha\beta$ | $\alpha$ | $\beta$ |

The quotient matrix for the finite projective plane of order 4. $I$ is the identity, and $\alpha,\beta$ generate $\mathbb{Z}_2 \times \mathbb{Z}_2$.