Refer to the following letter and symbol series and answer the question that follows. Counting is to be done from left to right only. (Left) D & @ L @ £ O & O G W © H N £ B € K Y & O Y (Right) How many such letters are there each of which is immediately preceded by a symbol and also immediately followed by a symbol?

Refer to the given number and symbol series and answer the question that follows. Counting is to be done from left to right only. All numbers are single-digit numbers. (Left) $ 9 $ 6 7 8 £ 5 1 8 2 £ 9 3 4 6 9 # 8 8 7 7 (Right) How many such numbers are there, each of which is immediately preceded by a symbol and also immediately followed by a symbol?

This question is based on the given words: DEN KIF BUN CAR In each of the words, each vowel is changed to the letter immediately following it in the English alphabetical order and each consonant is changed to the letter immediately preceding it in the English alphabetical order. In how many letter-clusters thus formed, will no vowel appear?