c(1,10)
c(1,15)
c(1,18)
c(1,2)
c(1,3)
c(1,4)
c(1,5)
c(1,7)
c(1,8)
c(1,9)
c(2,15)
c(2,3)
c(2,4)
c(2,5)
c(3,15)
c(3,4)
c(3,5)
c(4,15)
c(4,5)
c(7,10)
c(7,18)
c(7,8)
c(7,9)
c(8,10)
c(8,9)
d(1,10)
d(1,15)
d(1,18)
d(1,2)
d(1,3)
d(1,4)
d(1,5)
d(1,7)
d(1,8)
d(1,9)
d(2,15)
d(2,3)
d(2,4)
d(2,5)
d(3,15)
d(3,4)
d(3,5)
d(4,15)
d(4,5)
d(7,10)
d(7,18)
d(7,8)
d(7,9)
d(8,10)
d(8,9)
