Example sentences of "[noun sg] [vb -s] [prep] [adv] a [num ord] " in BNC.

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1 Social security accounts for about a third of total public spending in most western states .
2 Scotch Whisky accounts for over a third of UK food and drinks exports , and its contribution limited the total food and drink ( F&D ) trade deficit to £4 bn in 1991 .
3 Groundwater accounts for about a third of the public water supplies in Britain ; in the south and east of England dependence on supplies from groundwater is locally much greater .
4 The oilbird 's click lasts for about a hundredth of a second and is not a single sound but a burst of pulses , each only about a thousandth of a second long .
5 Thus just one granule absorbs at least a 500th of a drop .
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