Sets docs -- testing set membership: member? -> in?
Sets docs -- testing set membership: member? -> in?

erg/factor,mcandre/factor,erg/factor,erg/factor,mcandre/factor,erg/factor,mcandre/factor,kingcons/factor,ceninan/factor,mcandre/factor,cataska/factor,erg/factor,erg/factor,ceninan/factor,cataska/factor,cataska/factor,ceninan/factor,erg/factor,mcandre/factor,mcandre/factor,kingcons/factor,kingcons/factor,mcandre/factor,ceninan/factor,kingcons/factor,cataska/factor