what unicodes are listed?
u+25ec, u+22a1, u+26ed, u+26ef, u+26ee, u+6587, u+3036, u+3012, u+2b59, u+2613, u+2295, u+26fb, u+2b57, u+25c9, u+2b58, u+26e9, u+534d, u+26eb, u+26fc, u+2668, u+26ec, u+26f0
of those listed unicodes, which contain letters (besides u)?
u+25ec, u+22a1, u+26ed, u+26ef, u+26ee, u+2b59, u+26fb, u+2b57, u+25c9, u+2b58, u+26e9, u+534d, u+26eb, u+26fc, u+26ec, u+26f0
of those listed unicodes, which contain the letter a?
u+22a1