200
alike
What is different
300
sound
What is silence
300
remember
What is forget
300
safe
What is dangerous
300
sturdy
What is delicate
400
problem
What is solution
400
question
What is answer
400
refused
What is accepted
400
common
What is unusual
500
courage
What is cowardice
500
approximately
What is exactly
500
freedom
What is slavery
500
suddenly
What is gradually
500
miserable
What is happy