book

textbook

question

mark

faq

ask

education

blackboard

green

board

symbol

open

information

literature

sign

read

knowledge

problem

solution

answer

school

help

illustration

page

paper

text

study

learn

library

discovery

query

support

search

studying

learning

lesson

chalkboard

exploration

know

chalk

drawing

coaching

lecture

teaching

science

teach

hand

drawn

class

classroom