In a certain code language,
‘Several single port around’ is coded as ‘po xl yu vb’
‘Single event cost edition’ is coded as ‘rf zx vb wa’
‘Cost around public order’ is coded as ‘km po rf tf’
‘Public host winter edition’ is coded as ‘vc ur km zx’

If ‘several books’ is coded as ‘xl sa’ , then what will be the code for ‘port maintenance cost’?

To find the code for the phrase ‘port maintenance cost’, we first analyze and decode the given statements step-by-step:

1. Identify common words and codes:
- Compare ‘Several single port around’ (coded as ‘po xl yu vb’) and ‘Single event cost edition’ (coded as ‘rf zx vb wa’):
The common word is ‘single’, and the common code is ‘vb’.
Therefore, ‘single’ = ‘vb’.

- Compare ‘Several single port around’ (coded as ‘po xl yu vb’) and ‘Cost around public order’ (coded as ‘km po rf tf’):
The common word is ‘around’, and the common code is ‘po’.
Therefore, ‘around’ = ‘po’.

- Compare ‘Single event cost edition’ (coded as ‘rf zx vb wa’) and ‘Cost around public order’ (coded as ‘km po rf tf’):
The common word is ‘cost’, and the common code is ‘rf’.
Therefore, ‘cost’ = ‘rf’.

2. Decode the words in the first statement:
From the first statement, we have the words ‘Several’ and ‘port’ remaining, which must correspond to the remaining codes ‘xl’ and ‘yu’.
We are given that ‘several books’ is coded as ‘xl sa’.
Comparing these, the common word is ‘several’ and the common code is ‘xl’.
Therefore, ‘several’ = ‘xl’.
This leaves ‘port’ = ‘yu’.

3. Determine the code for ‘port maintenance cost’:
- The code for ‘port’ is ‘yu’.
- The code for ‘cost’ is ‘rf’.
- The word ‘maintenance’ does not appear in any of the original statements. Therefore, its code must be a new code that has not been used yet in the clues.
The codes already used in the clues are: ‘po’, ‘xl’, ‘yu’, ‘vb’, ‘rf’, ‘zx’, ‘wa’, ‘km’, ‘tf’, ‘vc’, ‘ur’.

Looking at the given options for a combination containing ‘yu’, ‘rf’, and a new code:
- ‘yu nh rf’ contains ‘yu’, ‘rf’, and a new code ‘nh’ (which is not in the list of used codes).
Thus, the code for ‘port maintenance cost’ is ‘yu nh rf’.