Likes ...
talcum powder
nickels
clams
pencils

coal
class
chaulk
clocks

Civil War
lichens
lock
clothes

calculus
local games
camels
Nickelodeon

ceiling
canal

But Dislikes ...
baby powder
dimes
oysters
pens

iron
detention
erasers
watches

Revolution
moss
key
hamper

geometry
away games
hippopotami
Cinemax

floor
river


Can you figure out why my friend likes certain things and not others?