AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
ABBBBBBBBBBBBBBBBBBAABBBBBBBBBBBBBBBBBBA
ABCCCCCCCCCCCCCCCCBAABCCCCCCCCCCCCCCCCBA
ABCDDDDDDDDDDDDDDCBAABCDDDDDDDDDDDDDDCBA
ABCDEEEEEEEEEEEEDCBAABCDEEEEEEEEEEEEDCBA
ABCDEFFFFFFFFFFEDCBAABCDEFFFFFFFFFFEDCBA
ABCDEFFFFFFFFFFEDCBAABCDEFFFFFFFFFFEDCBA
ABCDEEEEEEEEEEEEDCBAABCDEEEEEEEEEEEEDCBA
ABCDDDDDDDDDDDDDDCBAABCDDDDDDDDDDDDDDCBA
ABCCCCCCCCCCCCCCCCBAABCCCCCCCCCCCCCCCCBA
ABBBBBBBBBBBBBBBBBBAABBBBBBBBBBBBBBBBBBA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
ABBBBBBBBBBBBBBBBBBAABBBBBBBBBBBBBBBBBBA
ABCCCCCCCCCCCCCCCCBAABCCCCCCCCCCCCCCCCBA
ABCDDDDDDDDDDDDDDCBAABCDDDDDDDDDDDDDDCBA
ABCDEEEEEEEEEEEEDCBAABCDEEEEEEEEEEEEDCBA
ABCDEFFFFFFFFFFEDCBAABCDEFFFFFFFFFFEDCBA
ABCDEFFFFFFFFFFEDCBAABCDEFFFFFFFFFFEDCBA
ABCDEEEEEEEEEEEEDCBAABCDEEEEEEEEEEEEDCBA
ABCDDDDDDDDDDDDDDCBAABCDDDDDDDDDDDDDDCBA
ABCCCCCCCCCCCCCCCCBAABCCCCCCCCCCCCCCCCBA
ABBBBBBBBBBBBBBBBBBAABBBBBBBBBBBBBBBBBBA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA