numbers: cardinal / ordinal
Three versus third.
A cardinal number counts: three locks. An ordinal number ranks: the third lock. Do not use three when the rank is the point.
Examples
Use four copies
Use the fourth copy
Avoid the four copy
Three versus third.
A cardinal number counts: three locks. An ordinal number ranks: the third lock. Do not use three when the rank is the point.
Use four copies
Use the fourth copy
Avoid the four copy