43  US 9,411,230 B2  44  -continued  In the formulae, Ar$_{1}$ a  represents an arylene group which is  the same as that described above for X$_{1 }$to X$_{3 }$ in formulae (III) 45  to (VII).  Each of  Ar$_{2}$a  to  Ar$_{4}$ a  represents an aryl group which is the  same as that described above for R$_{201 }$to  R$_{203}$ ,  R$_{204 }$ and R$_{205 }$ in formulae  (ZI)  to  (ZII).  Roi represents a hydrogen atom, a methyl group, a chlo› romethyl group, a trifluoromethyl group or a cyano group.  Each of R$_{02 }$and R$_{021 }$represents a single bond, an arylene  group, an alkylene group, a cycloalkylene group, ---0-,  -S0$_{2}$ -,  CO-, -N(R$_{33}$)-, or a divalent linking group  formed by combining a plurality thereof, which are the same  as those described above for X$_{1 }$ to X$_{3 }$ in formulae (III) to  (VII).  Each ofR$_{03 }$and  R$_{019 }$ independently represents a hydrogen 60  atom, an alkyl group, a cycloalkyl group, an aryl group or an  aralkyl group. Examples of these groups are the same as those  described above for R$_{25 }$in formula (IV).  The repeating unit preferred as the repeating unit (R) fur- ther includes a repeating unit represented by any one of the  following formulae (I-7) to (I-34):  •4CH-~  f-•  I  I  C=O C=O  I  I  0  0  I  I  Ro19  Ro2  le  S03  (IV-3)  •4CH-~  f-•  I  I  C=O C=O  I  I  0  N-R03  I  I  Ro19  Ro2  le  S03  (IV-4)  •-+CH--CH+-•  I  I  O=C  C=O  ’-N/  Ar2a  I  eel  Ro21-S03  1 -Ar3a  Ar4a  (1-7)  x- (1-8)  x- (1-9)  x- (1-10)  (1-11)  (1-12)  (1-13)  (1-14) 