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The turtle-necked Lucifer proceeds to offer a brief yet comprehensive master class in his personal art of seduction: the offhand compliment about Jade’s smile, the display of his “amateur dialectologist” party trick, the intimation she might be out of Nate’s league.

Fingered speech is perfect for the dialectologist who wants lots of data but is short of time.

Prof David Britain, a dialectologist from the University of Bern in Switzerland, said the app might also shed light on the two pronunciations of the word "scone".