21.   Had this apparently contradictory programme been worked out over a long period, it might have seemed more logical.

22.   He was a light sleeper, for long periods an insomniac.

23.   In general, elite settlements stem from long periods of conflict and crises that threaten to rekindle widespread violence.

24.   In general, the mountain areas of the Auvergne experience a much colder winter climate with a long period of Permanent snow.

25.   In many cases they have gone long periods before they have even made a profit.

26.   In the Chandni Chowk shopkeepers boarded up their premises, buried their treasure and prepared for a long period of unrest.

27.   It also needs long periods of ecological stability during which evolutionary epochs can bring about the necessary organic synthesis.

28.   It is specially important not to let him vegetate in front of the television for long periods.