Stems set 3

OMNI- All, everywhere Omnipresent, omniscient
PED-, PEDI- Foot Pedicure,  pedometer
PER- Through, by, around Perimeter, perinatal
POST- Behind, after Postgame, postscript
PRE- Before, early Premature, pregame
PRO- Forward, in favor of Progressive, promote
RE-, RED- Again, against Remake, remix
RETRO- Behind, backwards Retrograde, retract
SEMI- Half Semiconductor, semicircle
SUB- Under, inferior Subtract, subway
SUPER-, SUPRA- Over, above Superstar, superb
SUR- Over, above Surcharge, surplus
TRANS- Across, over Transfer, transcontinental
ULTRA- Beyond Ultraviolet,  ultralight
UN- No, not, without Unheard, unusual