Each word in the two sets below can be changed in a similar way, though the change is different for each set. After the changes, the words in each set will have something in common, and the two sets will be related.

SET I

FIT

PER

FILE

VERB

GRAM

SET II

CUR

TACT

CEDE

DENSE

TEMPT

HINT:

It has to do with prefixes.

Answers:

Each word in Set I can be preceded by PRO, and each word in Set II can be preceded by CON.