Extracts the instance terms used in a prenex FOL Pi_1 expansion tree / Sigma_1 expansion sequent.
Each expansion tree is transformed into a list of pairs of its shallow formula and a tuple containing the terms
used to instantiate the outermost weak quantifier block.
Extracts the instance terms used in a prenex FOL Pi_1 expansion tree / Sigma_1 expansion sequent.
Each expansion tree is transformed into a list of pairs of its shallow formula and a tuple containing the terms used to instantiate the outermost weak quantifier block.