Substitute digits for the letters-6

Question: Substitute digits for the letters to make the following relation true.
W O R L D
+ T R A D E
-------------
C E N T E R
Note that the leftmost letter can't be zero in any word. Also, there must be a one-to-one mapping between digits and letters. e.g. if you substitute 3 for the letter W, no other letter can be 3 and all other W in the puzzle must be 3.

 

Answer:

It is obvious that C=1. Also, the maximum possible value of E is 7. Now, start putting possible values of D, E and R as they occure frequently and use trial-n-error.
W O R L D           5 3 6 8 4
+ T R A D E        + 7 6 0 4 2
------------ ------------
C E N T E R          1 2 9 7 2 6


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