I don't know, the "TT-skimming" semantics seem to give useful results in
at least some cases.
Probably most usefully, {broda na .i ja ba bo brode} would mean "if
broda, then afterwards brode".
Then there's the {ja} case I referred to in CLL, which seems reasonable.
For {jo}, it doesn't have an easy translation to english, but seems
plausibly useful anyway; e.g. {do ba prije gi'o ja'e bo snada} -> "you
will be wise and therefore successful, or neither".