cases a3_right
α : Type
inst✝ : DecidableEq α
σ_0 σ_1 : Type
M_0 : EpsilonNFA α σ_0
M_1 : EpsilonNFA α σ_1
p_0 q_0 : σ_0
xs : List (σ_0 ⊕ σ_1)
a2_right : Sum.inl q_0 ∈ xs
x : EpsilonArrow σ_0
a3_left : x ∈ M_0.epsilon_arrow_list
a3_right : x.start_state = p_0 ∧ List.map Sum.inl x.stop_state_list = xs
⊢ ∃ stop_state_list,
    { start_state := p_0, stop_state_list := stop_state_list } ∈ M_0.epsilon_arrow_list ∧ q_0 ∈ stop_state_list
case intro
α : Type
inst✝ : DecidableEq α
σ_0 σ_1 : Type
M_0 : EpsilonNFA α σ_0
M_1 : EpsilonNFA α σ_1
p_0 q_0 : σ_0
xs : List (σ_0 ⊕ σ_1)
a2_right : Sum.inl q_0 ∈ xs
x : EpsilonArrow σ_0
a3_left : x ∈ M_0.epsilon_arrow_list
left✝ : x.start_state = p_0
right✝ : List.map Sum.inl x.stop_state_list = xs
⊢ ∃ stop_state_list,
    { start_state := p_0, stop_state_list := stop_state_list } ∈ M_0.epsilon_arrow_list ∧ q_0 ∈ stop_state_list