Weird output of bison (or flex)

[bison q]

While the parsing is being done I get weird outputs such as
<>.<>.<>.<>.<>....<>.<>.

as much as I could understand, they might be related to reductions/shifts, 
but I'm really not sure about it - just a hunch "(since the output is 
different with every input).
I couldn't find the code which generets these outputs.
how can I avoid them?
what do they mean?

The outputs are printed in stdout.
I'm using bison 1.35 and 1.28 on LINUX and AIX and it always happens.
Just one last thing - I'm also using flex, and it might as well be generated 
from that....

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