[ a b c ]---< a>b?>---(Y)---[ ab c ]---< b>c?>---(Y)-------------------------------------[ abc ] | \---(N)---[ a cb ]---< a>c?>---(Y)---[ acb ] | \---(N)---[ cab ] \---(N)---[ ba c ]---< a>c?>---(Y)--------------------------------------[ bac ] \---(N)---[ b ca ]---< b>c?>---(Y)-----[ bca ] \----(N)----[ cba ]