Clearly, the only four-letter word is SHIP. So, its code is fvxm. The only five-letter word is RIDER. So, its code is kwwfj. The only six-letter word is RIOTER so its code is qykwwf. Clearly, the only seven-letter word is OSTRICH. So, its code is wfgmqxy. The only nine-letter word is DIRECTION. So, its code is gyfqljfwk. So, rearranging the words and their codes, we have:
Column I
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Column II
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(1) OSTRICH
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(A) wfgmqxy
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(2) RIDER
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(B) kwwfj
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(3) SHIP
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(C) fvxm
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(4) RIOTER
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(D) qykwwf
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(5) DIRECTION
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(E) gyfqljfwk
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From the word DIRECTION we can tell the code for ‘I’ which is ‘f’ due to repitition.
From the word RIDER or RIOTER we can tell the code for ‘R’ which is ‘w’ due to repitition.
From the words OSTRICH and SHIP we can tell the code for ‘P’ which is ‘v’ as all alphabets of SHIP are in OSTRICH except ‘p’.
Now in RIDER and RIOTER ‘R’ and ‘I’ are ‘w’ and ‘f’ respectively, now ‘D’ has to be ‘j’ as it is uncommon to both and so ‘E’ has to be ‘k’ as it is the last alphabet left in RIDER rider. Clearly, the code letter for I is f.