while true do

akw_on  = "10"
akw_off = "30"
akw_n = 5

akw_run = "(akw_on+akw_off)/akw_n"

 brc = "back" -- bundle redstone cable

c1 = blue
c2 = green
c3 = red
c4 = yellow
c5 = white
c6 = grey

rs.setBundledOutput(brc, colors.combine(colors.c1,colors.c2))
sleep(akw_run)
rs.setBundledOutput(brc, colors.combine(colors.c2,colors.c3))
sleep(akw_run)
rs.setBundledOutput(brc, colors.combine(colors.c3,colors.c4))
sleep(akw_run)
rs.setBundledOutput(brc, colors.combine(colors.c4,colors.c5))
sleep(akw_run)
rs.setBundledOutput(brc, colors.combine(colors.c5,colors.c1))
sleep(akw_run)

end