/ 3 ___ 3 ___ ___\ / 3 ___ 3 ___ ___\ / 3 ___ 3 ___ ___\ / 3 ___ 3 ___ ___\ / 3 ___\ / 3 ___\ | \/ 2 I*\/ 2 *\/ 3 | | \/ 2 I*\/ 2 *\/ 3 | | \/ 2 I*\/ 2 *\/ 3 | | \/ 2 I*\/ 2 *\/ 3 | \x + \/ 2 /*\x - \/ 2 /*|x + ----- + -------------|*|x + ----- - -------------|*|x + - ----- + -------------|*|x + - ----- - -------------| \ 2 2 / \ 2 2 / \ 2 2 / \ 2 2 /