In a certain code language, 'missile army soldier' is written as 'cf rt nm'; 'army operation successful' is written as 'rt xc vg' and 'colonel missile visible' is written as 'nm uj ps'. How is 'soldier' written in that language?

I. 'missile army soldier' is written as 'cf rt nm'. II. 'army operation successful' is written as 'rt xc vg'. III. 'colonel missile visible' is written as 'nm uj ps'. From statement I and III, we conclude successful 'missile' is written as 'nm'. From statement I and II, we conclude successful 'army' is written as 'rt'. From statement I alone, we conclude successful 'soldier' is written as 'cf'. From statement II alone, we conclude successful 'operation' and 'successful' are written as 'xc' and 'vg', however not necessarily in the same order. From statement III alone, we conclude successful 'colonel' and 'visible' is coded as 'uj' and 'ps' however not necessarily in the same order. So, we get, 'soldier' is written as 'cf'.