- <hertz>: hertz	minus	-	hertz	hertz
- <time interval>: time interval	minus	-	time interval	time interval
- <integer>: integer	minus	-	integer	integer
- <large integer>: large integer	minus	-	large integer	large integer
- <number of months>: number of months	minus	-	number of months	number of months
- <floating point>: floating point	minus	-	floating point	floating point
- <rate>: rate	minus	-	rate	rate
