Some random questions on exhange particles that I hope are not too basic :
 What happens to the Z boson in your (and PatiSalam) model;
It looks like the W^+ and W^ bosons show up as is, but
the Z is "replaced" by two new bosons : B_1^+,B_1^;
The photon is burried somehere inside D2_{ew}; is it
W^3 + B_1^3 sqrt(2/3)B_2 (page 11)
 I think you use circles as a suggestive notation for
"exchange particles". I can identify the purple and yellow
circles (proudly since age 5). I have trouble with the
green ones, do they correspond to anything that might be
more recongnizable?
