Drat2er is a tool for transforming proofs that are usually produced by
SAT solvers. It takes as input a propositional formula (specified in
the DIMACS format) together with a DRAT proof (DRAT is the current
standard format for proofs in SAT solving), and outputs an
extended-resolution proof of the formula in either the TRACECHECK or
the DRAT format. The details of this proof transformation are
described in the paper "Extended Resolution Simulates DRAT" (IJCAR
2018). Note that if drat2er is given as input a DRUP proof, then it
transforms this DRUP proof into an ordinary resolution proof.
