Performing different combinations results in different overall attacks - for
example typing "LS" will throw a clumsy punch with your left hand, but if you
perform "LF" beforehand (to clench your fist) then you'll throw a jab instead.
If you had withdrawn your hand ("LW") before clenching it, then instead of a
jab, you'd throw a powerful stunning blow.  To list the combinations available
see the help files for "hands", "feet" and "eyes".

Note that the jumping techniques are unique in that they require timing - once
your feet leave the ground, you have only two seconds to perform another move
with your legs otherwise you land again.  The majority of moves rely purely on
the order of the techniques, regardless of timing.  In many cases it's often 
worth stalling a blow until the right moment - perhaps waiting until you're 
able to sweep your opponent (or until they're off-balance from trying to kick 
you) before moving in with a devastating flurry of punches that they cannot 
hope to avoid.