Seeking help with xkbcomp

[Blake McBride]

Greetings,

I am trying to map an APL keyboard with xkbcomp.  I am starting with a
mapping that works somewhat.  My problem has to do with the fact that some
keys on the keyboard produce five different characters.  I am using normal,
shift, right-alt, and right-alt-shift for four of the characters.  That
works.  I want to add a mapping for right-alt-ctl to get that last
character.

I have spent many hours reading and trying everything I can think of with
no luck.  (BTW, I am the latest 64 bit LinuxMint).

I think the problem I have is that my Group2 keys need to have 3 levels.
 They seem to only have two now.  Group2 is set with Right-Alt key.  The
second level of that group is shift.  This all works now.  I want to add a
third level signified by the Control key.  So, group2 would have three
levels - normal, shift, and Control.

I am quite lost.  My guess is that no more than half a dozen lines of
config would fix my problem.  I just can not figure out what to do.  If
anyone can offer any assistance, I would sure appreciate it.

I am enclose a copy of the original file in case there is any interested.

Thank you.

Blake McBride
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