the Floral Clock stand Mirror Lake year though unable time remind people passage time good old daysOn rim Floral Clock 2n flower number 1 2n clockwise colour n possible one for colour exactly flower distance equal 2 equal n Additionally flower u v colour flower opposite u opposite v colour symmetry beautifulformally distance flower 1 plus number flower minor arc semicircle below possible arrangement n6 cover possibility the beauty arrangement define product length flower segment separate opposite flower colour in word order compute beauty remove circle flower colour flower opposite then beauty product length remain segment note include segment length 0 product if flower colour flower opposite beauty equal 0 for instance beauty arrangement equal 13139 segment 2 456 8 101112while keeping constraint satisfy lot different arrangement find sum beauty possible arrangement modulo 998244353 two arrangement consider different pair uv 1uv2n exist flower u v colour