may; might; perhaps; may be; possibly
discovery; detection; finding
stopping functioning; being out of service
confirmation; verification; validation; review; check; affirmation
collection; recovery; withdrawal; retrieval
work; operation; manufacturing; fatigue duty
to put in; to let in; to admit; to accept; to accept; to comply; to include
to explain; to dispel doubts
the past; bygone days; one's past (that one would prefer remained secret); past (tense); preterit; previous life
to tie; to bind; to fasten; to restrict (freedom); to tie down (with rules, regulations, etc.); to fetter