/ _____ _____\ / _____ _____\ / _____ _____\ / _____ _____\ / _____\ / _____\ | ___ 8 / 20 ___ 8 / 20 | | ___ 8 / 20 ___ 8 / 20 | | ___ 8 / 20 ___ 8 / 20 | | ___ 8 / 20 ___ 8 / 20 | / _____\ / _____\ | 8 / 20 | | 8 / 20 | | \/ 2 *\/ d I*\/ 2 *\/ d | | \/ 2 *\/ d I*\/ 2 *\/ d | | \/ 2 *\/ d I*\/ 2 *\/ d | | \/ 2 *\/ d I*\/ 2 *\/ d | | 8 / 20 | | 8 / 20 | \c + I*\/ d /*\c - I*\/ d /*|c + -------------- + ----------------|*|c + -------------- - ----------------|*|c + - -------------- + ----------------|*|c + - -------------- - ----------------|*\c + \/ d /*\c - \/ d / \ 2 2 / \ 2 2 / \ 2 2 / \ 2 2 /