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liber (free) liberation (the process of setting free)

log (word, study, speech) logic (the study of thinking and reasoning)

lum (light) illuminate (to provide with lights)

magn (great) magnify (to make something appear larger)

man (hand) manacle (handcuffs)

mania (insanity) pyromania (crazy urge to start fires)

medi (middle, between) median (located in the middle)

mega (great) megabit (one million bits)

mem (remember) memorial (something that serves as a remembrance)

meter (measure) thermometer (an instrument that measures temperatures)