13

Yellow<Blue (1÷12)
Magenta<Green (9+4)
Cyan<Red (8+5)

yellow ● >>
yellow green
green ○ <
green cyan
cyan ● >
blue cyan
blue ○ <<
blue magenta
magenta ● >
red magenta
red ○ <
orange
yellow ● >>
yellow green
green ○ <
green cyan
cyan ● >
blue cyan
blue ○ <<
blue magenta
magenta ● >
red magenta
red ○ <
orange
yellow ● >>

..

15 blue cyan (XX)
..
13 blue
11 blue magenta
09 magenta <
07 red magenta
05 red
03 orange
01 yellow <<
02 yellow green
04 green
06 green cyan
08 cyan <
10 blue cyan
12 blue
..
14 blue magenta (XX)