Cyrillic

Here we have the sky thrice, three welkins, three lights, three heavens, three earths.

Dirk Kuyt sandwiched a goal in between Carroll's double as City endured a night of total misery, with captain Carlos Tevez limping off early on with a hamstring strain that puts a serious question mark over his participation in Saturday's FA Cup semi-final against Manchester United at Wembley.

However, given the phenomenon of triallelism, it is no longer possible to be certain that the recurrence risk in an affected family will be as high as 25 per cent as it may be a requirement in up to 10 per cent of pedigrees for three mutant alleles to co-segregate.