+ 0 1 x x + 1 x 2 x 2 + 1 x 2 + x x 2 + x + 1 x 3 x 3 + 1 x 3 + x x 3 + x + 1 x 3 + x 2 x 3 + x 2 + 1 x 3 + x 2 + x x 3 + x 2 + x + 1 0 0 1 x x + 1 x 2 x 2 + 1 x 2 + x x 3 + x 2 + x + 1 8 9 10 11 12 13 14 15 1 1 0 x + 1 x x 2 + 1 x 2 x 2 + x + 1 8 9 10 11 12 13 14 15 0 x x x + 1 0 1 x 2 + x x 2 + x + 1 x 2 9 10 11 12 13 14 15 0 1 x + 1 x + 1 x 1 0 x 2 + x + 1 x 2 + x x 2 + 1 10 11 12 13 14 15 0 1 2 x 2 x 2 x 2 + 1 x 2 + x x 2 + x + 1 0 1 x 11 12 13 14 15 0 1 2 3 x 2 + 1 x 2 + 1 x 2 x 2 + x + 1 x 2 + x 1 0 x + 1 12 13 14 15 0 1 2 3 4 x 2 + x x 2 + x x 2 + x + 1 x 2 x 2 + 1 x x + 1 0 13 14 15 0 1 2 3 4 5 x 2 + x + 1 x 2 + x + 1 x 2 + x x 2 + 1 x 2 x + 1 x 1 14 15 0 1 2 3 4 5 6 x 3 x 3 x 3 + 1 x 3 + x x 3 + x + 1 x 3 + x 2 x 3 + x 2 + 1 x 3 + x 2 + x 15 0 1 2 3 4 5 6 7 x 3 + 1 x 3 + 1 x 3 x 3 + x + 1 x 3 + x x 3 + x 2 + 1 x 3 + x 2 x 3 + x 2 + x + 1 0 1 2 3 4 5 6 7 8 x 3 + x x 3 + x x 3 + x + 1 x 3 x 3 + 1 x 3 + x 2 + x x 3 + x 2 + x + 1 x 3 + x 2 1 2 3 4 5 6 7 8 9 x 3 + x + 1 x 3 + x + 1 x 3 + x x 3 + 1 x 3 x 3 + x 2 + x + 1 x 3 + x 2 + x x 3 + x 2 + 1 2 3 4 5 6 7 8 9 10 x 3 + x 2 x 3 + x 2 x 3 + x 2 + 1 x 3 + x 2 + x x 3 + x 2 + x + 1 x 3 x 3 + 1 x 3 + x 3 4 5 6 7 8 9 10 11 x 3 + x 2 + 1 x 3 + x 2 + 1 x 3 + x 2 x 3 + x 2 + x + 1 x 3 + x 2 + x x 3 + 1 x 3 x 3 + x + 1 4 5 6 7 8 9 10 11 12 x 3 + x 2 + x x 3 + x 2 + x x 3 + x 2 + x + 1 x 3 + x 2 x 3 + x 2 + 1 x 3 + x x 3 + x + 1 x 3 5 6 7 8 9 10 11 12 13 x 3 + x 2 + x + 1 x 3 + x 2 + x + 1 x 3 + x 2 + x x 3 + x 2 + 1 x 3 + x 2 x 3 + x + 1 x 3 + x x 3 + 1 6 7 8 9 10 11 12 13 14 {\displaystyle {\begin{array}{c||c|c|c|c|c|c|c|c|c|c|c|c|c|c|c|c|}+&0&1&x&x+1&x^{2}&x^{2}+1&x^{2}+x&x^{2}+x+1&x^{3}&x^{3}+1&x^{3}+x&x^{3}+x+1&x^{3}+x^{2}&x^{3}+x^{2}+1&x^{3}+x^{2}+x&x^{3}+x^{2}+x+1\\\hline 0&0&1&x&x+1&x^{2}&x^{2}+1&x^{2}+xx^{3}+x^{2}+x+1&8&9&10&11&12&13&14&15\\1&1&0&x+1&x&x^{2}+1&x^{2}&x^{2}+x+1&8&9&10&11&12&13&14&15&0\\x&x&x+1&0&1&x^{2}+x&x^{2}+x+1&x^{2}&9&10&11&12&13&14&15&0&1\\x+1&x+1&x&1&0&x^{2}+x+1&x^{2}+x&x^{2}+1&10&11&12&13&14&15&0&1&2\\x^{2}&x^{2}&x^{2}+1&x^{2}+x&x^{2}+x+1&0&1&x&11&12&13&14&15&0&1&2&3\\x^{2}+1&x^{2}+1&x^{2}&x^{2}+x+1&x^{2}+x&1&0&x+1&12&13&14&15&0&1&2&3&4\\x^{2}+x&x^{2}+x&x^{2}+x+1&x^{2}&x^{2}+1&x&x+1&0&13&14&15&0&1&2&3&4&5\\x^{2}+x+1&x^{2}+x+1&x^{2}+x&x^{2}+1&x^{2}&x+1&x&1&14&15&0&1&2&3&4&5&6\\x^{3}&x^{3}&x^{3}+1&x^{3}+x&x^{3}+x+1&x^{3}+x^{2}&x^{3}+x^{2}+1&x^{3}+x^{2}+x&15&0&1&2&3&4&5&6&7\\x^{3}+1&x^{3}+1&x^{3}&x^{3}+x+1&x^{3}+x&x^{3}+x^{2}+1&x^{3}+x^{2}&x^{3}+x^{2}+x+1&0&1&2&3&4&5&6&7&8\\x^{3}+x&x^{3}+x&x^{3}+x+1&x^{3}&x^{3}+1&x^{3}+x^{2}+x&x^{3}+x^{2}+x+1&x^{3}+x^{2}&1&2&3&4&5&6&7&8&9\\x^{3}+x+1&x^{3}+x+1&x^{3}+x&x^{3}+1&x^{3}&x^{3}+x^{2}+x+1&x^{3}+x^{2}+x&x^{3}+x^{2}+1&2&3&4&5&6&7&8&9&10\\x^{3}+x^{2}&x^{3}+x^{2}&x^{3}+x^{2}+1&x^{3}+x^{2}+x&x^{3}+x^{2}+x+1&x^{3}&x^{3}+1&x^{3}+x&3&4&5&6&7&8&9&10&11\\x^{3}+x^{2}+1&x^{3}+x^{2}+1&x^{3}+x^{2}&x^{3}+x^{2}+x+1&x^{3}+x^{2}+x&x^{3}+1&x^{3}&x^{3}+x+1&4&5&6&7&8&9&10&11&12\\x^{3}+x^{2}+x&x^{3}+x^{2}+x&x^{3}+x^{2}+x+1&x^{3}+x^{2}&x^{3}+x^{2}+1&x^{3}+x&x^{3}+x+1&x^{3}&5&6&7&8&9&10&11&12&13\\x^{3}+x^{2}+x+1&x^{3}+x^{2}+x+1&x^{3}+x^{2}+x&x^{3}+x^{2}+1&x^{3}+x^{2}&x^{3}+x+1&x^{3}+x&x^{3}+1&6&7&8&9&10&11&12&13&14\\\end{array}}}