| 109 | sage: H.massey_products(H.3,H.2,H.3,H.2) |

| 110 | |

| 111 | set([c_2_2, a 2-Cochain in H^*(D8; GF(2)), |

| 112 | b_1_1^2+c_2_2, a 2-Cochain in H^*(D8; GF(2)), |

| 113 | b_1_0^2+c_2_2, a 2-Cochain in H^*(D8; GF(2)), |

| 114 | b_1_1^2+b_1_0^2+c_2_2, a 2-Cochain in H^*(D8; GF(2))]) |

| 115 | sage: H.massey_products(H.2,H.3,H.2,H.3) |

| 116 | |

| 117 | set([c_2_2, a 2-Cochain in H^*(D8; GF(2)), |

| 118 | b_1_0^2+c_2_2, a 2-Cochain in H^*(D8; GF(2)), |

| 119 | b_1_1^2+b_1_0^2+c_2_2, a 2-Cochain in H^*(D8; GF(2)), |

| 120 | b_1_1^2+c_2_2, a 2-Cochain in H^*(D8; GF(2))]) |