1.   It is not possible to lay down rigid rules on sentencing - judges must be free to use their discretion.

2.   Rigid rules and patterns take the place of more flexible thinking about feelings.

3.   Such rigid rules almost inevitably set up a nightly struggle that exhausts everyone.

4.   The ephemeral nature of fluid flow belies the rigid rules which govern its behaviour.

5.   The rigid rules for turn and turn about social calls are no longer observed.

6.   They can prefer the certainty and security offered by rigid rules.

7.   This means organizations must continue to set norms and create a corporate culture but not lay down rigid rules.

8.   Several colleges in our study have rigid rules about student conduct.

9.   There are very many such influences on grouping structure, so that rigid rules would be almost impossible to specify.