1.   The purity of heroin on the streets has increased more than four times.

2.   Thom identifies seven elementary catastrophes as the only possible results when not more than four control factors are present.

3.   The major part of the time would be spent in at least two and no more than four groups meeting around the building.

4.   Cheques to be signed by two councillors out of not more than four approved signatories.

5.   This figure exceeds the annual growth in the labour force during the boom by a factor of more than four.

6.   Also avoid attaching more than four sets of lights end to end, which is dangerous and may blow a fuse.

7.   And they could start by getting more than four hits in a game.

8.   BellSouth bid more than four times the minimum price set by the government in an auction of a license to offer cellular service in Sao Paulo.

9.   BellSouth will pay more than four times the minimum price set by the government in an auction of the rights to offer cellular service in Sao Paulo.