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! A row of five black square tiles is to have a number of its tiles replaced
-! with coloured oblong tiles chosen from red (length two), green (length
+! with colored oblong tiles chosen from red (length two), green (length
! three), or blue (length four).
! If red tiles are chosen there are exactly seven ways this can be done.
! If green tiles are chosen there are three ways.
! And if blue tiles are chosen there are two ways.
-! Assuming that colours cannot be mixed there are 7 + 3 + 2 = 12 ways of
+! Assuming that colors cannot be mixed there are 7 + 3 + 2 = 12 ways of
! replacing the black tiles in a row measuring five units in length.
! How many different ways can the black tiles in a row measuring fifty units in
-! length be replaced if colours cannot be mixed and at least one coloured tile
+! length be replaced if colors cannot be mixed and at least one coloured tile
! must be used?