61.   The rules are quite simple.

62.   The rules are simple in that all you have to do is to move the blocks around to free the prisoner.

63.   The rules are there in black and white for everyone to see.

64.   The rules are too nebulous to be applied consistently.

65.   The rules vary from place to place, but there are always rules.

66.   The strategic support group ground rules were all they needed to get started.

67.   There are Inland Revenue rules as to the amount you can invest, which varies according to your age.

68.   There are some rules which can guide us.

69.   There are strict rules about keeping tax records.

70.   There are strict rules about the use of dangerous chemicals.