If ‘dear’ is coded as 1234, ‘head’ is coded as 2345, ‘tear’ is coded as 1346, ‘help’ is coded as 4758, then
The letter "e" is there in every word and the number "4" is there in every code. So, 4 represents e.
Similarly, 1 represents r and 5 represents h as dear is coded as 1234 and r is dropped from dear and h is added to get head. Head is coded as 2345 ( 1 dropped and 5 added).
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