PPP
Fr×an i+CvnFr \times a_{\angl{\scriptsize n } \ i} + C v^nFr×an i+Cvn
C+C(g−i)an iC+C(g-i) a_{\angl{\scriptsize n } \ i}C+C(g−i)an i
Fran-t +Cvn−tFra_{\angl{\scriptsize n-t }}+Cv^{n-t}Fran-t +Cvn−t
t=?t=?t=?