first presentation
first presenting
first president
first principal component
first principles
first principles calculations
first problem
first procedure
first prospective study
first psychotic episode
first publication
first published

first quarter
first quartile
first question
first reaction
first reading
first record
first recurrence
first reduction
first reference
first relapse
first remission
first report
first report demonstrating

first report showing
first reported case
first reported use
first representative
first reproduction
first request
first responders
first response
first results
first review
first rib
first round
first row

first run
first sample
first sampling
first scenario
first screening
first season
first second
first section
first segment
first semester
first sensation
first separation
first series

first session
first set
first sexual intercourse
first sexual maturity
first shows
first sight
first signs
first site