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In each of these problems, letters represent single-digit numbers. If a letter is used more than once, it represents the same number in that problem. How many solutions can you find?
Question 1: AAA
+BBB
------
CCC
Question 2: MMM
NNN
+ PPP
------
QQQ
Question 3: TTT
x S
------
RRR
Question 4: ABC
+DEF
------
GHI
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