  We present a new FORM program for analytically evaluating four-loop massless
propagator-type Feynman integrals in an efficient way. Our program Forcer
implements parametric reductions of the aforementioned class of Feynman
integrals into a set of master integrals and can be considered as a four-loop
extension of the three-loop Mincer program. Since the program structure at the
four-loop level is highly complicated and the equations easily become lengthy,
most of the code was generated in an automatic way or with computer-assisted
derivations. We have checked correctness of the program by recomputing
already-known quantities in the literature.
