semi-, spiro-, sub-, super-, syn-, sym- etc
Sino-
"Im" is a common prefix in itself, you don't add a prefix to a prefix.
Portable!
Anterior ,
Superdupercalafragilisticexpialadoshious.
Aftershock Aftershock
Dodecagon
repair
conifer
consequence
"Second-hand" is a word that starts with the prefix "se-".
The prefix for "solicited" is "s-".