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SATIN - 35247

SCARE - 26839

SOUT - 0341

Common letter in these three words is 'S' and common number is '3'

Now, 'A' is common in the first two words and common number apart from '3' is '2'.

And, 'T' is common in the first and third words whereas, common number is '4'.

So, we have codes for the following letters as below:

S - 3

A - 2

T - 4

From the first word, we have choices for 'I' as '5' or '7'

Thus, 'I' can be written as '5'.