A group of people , one holding a yellow and blue umbrella , are standing at the top of some stairs .
It is certain that a crowd prepares to descend a staircase in the rain .
Chances are about even that a crowd prepares to descend a staircase in the rain .
It is certain that a crowd prepares to descend a staircase in the rain .
A crowd prepares to descend a staircase in the rain .