Hint Immediate col_trivial_1 col_trivial_2 col_trivial_3: col.
Section T4_4.
Context `{TnEQD:Tarski_neutral_dimensionless_with_decidable_point_equality}.

Lemma l4_14 : forall A B C A' B',
Col A B C -> Cong A B A' B' -> exists C', Cong_3 A B C A' B' C'.