Take a word, say, 'SIGHT'. Place the first and the last letters together--please do not separate them. Here we have 'ST'. Now our task is to find a word that contains 'ST' together--for example, 'STRAIGHT' , 'ASTROLOGY', 'FAST' Another example: TWINE We have 'te' We can find words like--TEAR, TEN, ENLIGHTEN, WRITE.