code: @Override
      public <H, I> Choice7<A, B, C, D, E, H, I> biMap(Function<? super F, ? extends H> lFn,
                                                       Function<? super G, ? extends I> rFn) {
          return match(Choice7::a, Choice7::b, Choice7::c, Choice7::d, Choice7::e, f -> f(lFn.apply(f)), g -> g(rFn.apply(g)));
      }
docs: {@inheritDoc}