a balloon
a breakthrough
a problem
a restroom
a result
a sculpture
a study
a thought
a water closet
an answer
an association
an exclamation mark
an idea
attendance refusal
consideration
deja vu
discovery
flash
invention
is troubled
it occurs to me
know
learn
learning
mark
meditation
memory loss
mysterious credit
neurosis
philosophy
remember
review
sit
sit down
solution
study
take a break
the life
the truth
thinking person
thought
trick