  There seem to be recently an evidence for $C =$ -1 exchanges in $p p$ and $p
\bar p$ elastic scattering at high energies. The analysis there is difficult as
the two processes were not measured at the same (large) energies. Here we
discuss three different exclusive processes given in the title as a possible
source of information for odderon exchange. A sketch of the formalism is
presented for each of the reactions. We consider low energy processes measured
in the past by the WA102 collaboration and try to make predictions for the LHC.
We discuss possible evidences at the low energies and try to make suggestions
for the LHC.
