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Step * of Lemma context-subset-subtype-and

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∀[Gamma:j⊢]. ∀[phi1,phi2:{Gamma ⊢ _:𝔽}].  ({Gamma, phi1 ⊢ _} ⊆r {Gamma, (phi1 ∧ phi2) ⊢ _})
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\mforall{}[Gamma:j\mvdash{}].  \mforall{}[phi1,phi2:\{Gamma  \mvdash{}  \_:\mBbbF{}\}].    (\{Gamma,  phi1  \mvdash{}  \_\}  \msubseteq{}r  \{Gamma,  (phi1  \mwedge{}  phi2)  \mvdash{}  \_\})


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