number of risk factors number of risks number of rivers number of road number of road deaths number of roads number of roles number of rollers number of rolls number of roma number of roman number of room number of rooms number of rotations number of rounds number of routes number of rows number of rules number of runs number of rural number of russian number of safeguards number of safety number of sales number of sample number of samples number of sampling number of satellites number of scans number of scenarios number of scenes number of schemes number of scholars number of scholarships number of school number of schools number of science number of scientific number of scientific publications number of scientists number of screens number of sculptures number of sea number of seals number of search number of searches number of seasons number of seats number of seats available number of second number of secondary number of seconds number of sections number of sectors number of securities number of security number of seeds number of segments number of seizures number of selected number of self-employed number of sellers number of senators number of senior number of seniors number of sensors number of sentences number of sequences number of series number of serious number of server number of servers number of service number of service providers number of services number of servings number of sessions number of sets number of settlements number of settlers number of severe number of sex number of shapes number of shared number of shareholders number of shares number of sheep number of sheets number of shelves number of shipments number of ships number of shoes number of shopping number of shops number of short number of short stories number of shots number of shows number of sick