71.   The period of patency is very long, exceeding two years in all the genera examined.

72.   The prepatent period is seven weeks, and the worms can live in the dog for more than two years.

73.   It kept her mind off her own -- like the disturbing fact that her period was now several days late.

74.   The recognised incubation period is fifteen hours or more.

75.   For Mrs Walker, that period was not only a worrying time but a costly one.

76.   There was a period of uncertainty.

77.   There was a period of considerable pressure on the Gala line with the final lunge by David Kent being stopped five metres out.

78.   These can be centred if circumstances such as seasonal fluctuation require that the period be even.

79.   But she but her period was a week and half late and she started well panicking!

80.   Although that time period was particularly dark, it was also bright with love.