Questions about Jazz chords

[Kees Serier]

Hello,

I'm trying to learn LilyPond, I previously used abcm2ps and abctab2ps, since
Lily combines both, and knows how to print complex cordnames.

I want a B13 chordname, so I try b:13, but that gives me a B9/add13, which may
be correct, but is not what I want.

How do I get a flat sign in front of a number?
E.g. how to get a "A7b13" a:7?13 where I used the lower case b as a flat sign.

How can I get a "C6 9"? if I try c:69, I also get a C9/add13

How can I get a "half-dim" chord, with a / through the O?

In the Appendix there are a lot of nice examples, unfortunately without source.

Thanks in advance,

Regards,

Kees