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- first sacral vertebra,second sacral vertebra(or nerve)etc.
- first sale
- first-sale doctrine
- first sale doctrine
- first saloon passenger
- first sample
- firsts and seconds
- first scale-step
- first scattering angle
- first-scattering angle
- first school
- first schools
- firstscope
- first screen
- first scutching machine
- First Sea Lord
- first-season
- first season crop
- first season tea
- first,second,etc.,backcros generations
- first,second,third,ete.,generations obtained byinbreeding
- first,second,third,juxtamating-generation
- first,second,third stage lues
- First Secretaries
- First Secretary
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