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laboratory’s
laboratories'
- its
- ours
- mine
- yours
- family’s
- families’
- man’s
- men’s
- girl’s
- girls’
- hers
- theirs
- brother’s
- brothers’
- teacher’s
- teachers’
- aunt’s
- aunts’
- boy’s
- boys’
- country’s
- countries’
- witness’s
- witnesses’
laboratory’s
laboratories'