hypo-

infra-

sub-

pre-

pro-

dipl-

diplo-

mono-

uni-

multi-

poly-

circum-

peri-

dia-

trans-

ecto-

exo-

extra-

endo-

intra-

a-

an-

without, not

The prefix a- is usually used before a consonat.  The prefix an- is usually used before a vowel.

anti-

contra-

homo-

homeo-

mal-

syn-

sym-

union, together, joined

The prefix syn- appears as sym- before b, p, ph, or m