<P> Modified stairway for the elderly in Thailand . </P> <Li> <P> The Potemkin Stairs (1834--41) in Odessa, Ukraine . </P> </Li> <P> The Potemkin Stairs (1834--41) in Odessa, Ukraine . </P> <Li> <P> Spiral stairs with ornamental balusters . </P> </Li>

How many step are in a flight of stairs