The entire gamut of the view's changes should have been known to her; its winter aspect, spring, summer and autumn; how storms came up from the sea; how the moors shuddered and brightened as the clouds went over; she should have noted the red spot where the villas were building; and the criss-cross of lines where the allotments were cut...

Gasoline is the lifeblood of the modern city.

Still, those constraints need to be considered and discussed explicitly for the sake of clarity and exhaustivity when reporting results.

The central ideas of variationist sociolinguistics are that an understanding of language requires an understanding of variable as well as categorical processes, and that the variation witnessed at all levels of language is not random.