...sharps go up to i. so la sharp is li, etc...

'cept it's pronounced "lee" (just like "mi" and "ti").

In solfege, the upper and lower adjacent 1/2 steps being variants of the major scale dependent on direction (as etaoin described) embed an unnecessary if not overweighted advantage to western harmony into the ears of the trainee...

... but, then again, that might be one's goal.