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.