The sequence $W$, three sumfree classes covering $\hat W$, and four sumfree sets covering $\mathbb{Z}_7 \times \mathbb{Z}_7 \setminus \{0\}$

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The sequence $W$, three sumfree classes covering $\hat W$, and four sumfree sets covering $\mathbb{Z}_7 \times \mathbb{Z}_7 \setminus \{0\}$ · Prove2Me