US 2020/0050105 Al  33  Feb. 13, 2020  -continued  hich recurring  from w  t  I  f  the monomer  t 11•mited there o.  P  es o  1  but no  [0086]  Ex~  are shown be ow,  •t (f2) is denved  um .  d fined above.  RA  is as e  -continued  i;o, ¢_  ,~--\0,  6 +s-O  F  ~  I#  i;o, ¢  _  ,~--\0,  6 +s-O  F  ~  I#  RA  ~0  i:o,  ¢ _  ,~--\0,  6 +s-O  F  ~  I#  1°,  I#  ,~--\0,  6 +s-O  F  ~  I# 