PQp( r )
PQp takes as argument a record r containing all information necessary
to restore a PQp record Q. A PQp record Q is printed as function
call to PQp with an argument describing Q. This is necessary because
the internal power-commutator representation cannot be printed. Therefore
all information about Q is encoded in a record r and Q is printed
as PQp( <r> ).
GAP 3.4.4