case dia' α φ =>
  sorry
Y : TNode
y : Formula
y_in_Y :
  y ∈
    match Y with
    | (L, R, none) => ↑(L ++ R)
    | (L, R, some (Sum.inl (~'χ))) => ↑(L ++ R) + {~unload χ}
    | (L, R, some (Sum.inr (~'χ))) => ↑(L ++ R) + {~unload χ}
α : Program
φ : Formula
Y_in_ress : ∃ a b, (a, b) ∈ unfoldDiamondLoad' α φ ∧ ([], a, Option.map Sum.inr b) = Y
⊢ lmOfFormula y < 1 + (lmOfProgram α + lmOfFormula φ)
no goals