answer
ask
black
blackboard
board
chalk
chalkboard
class
classroom
communicate
communication
concept
data
education
faq
graphic
help
helpdesk
i
icon
idea
illustration
info
inform
information
informative
internet
know
knowledge
learn
learning
letter
line
message
nobody
outline
question
school
search
service
sign
simple
smudged
speech
support
symbol
table
text
white