28. Starting from any of the $L$ 's, the word $L E V E L$ can be spelled by moving either up, down, left or right to an adjacent letter. If the same letter may be used twice in each spell, how many different ways are there to spell the word $L E V E L$ ?
28. Ans: 144 .
There are total 12 ways starting from any of the $L$ 's to reach the middle $V$. Hence the total number of ways to spell the word $L E V E L$ is $12^{2}=144$.