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Solutions

The Computer A was bought on June.

Only one Computer was bought between A and F.

Two Computers were bought between D and E.

The Computer E was bought just after B. We cannot fix the position of B in case 1A and Case 2A, So these cases are eliminated.

Three Computers were bought between G and C.
The Computer C was bought after G. We cannot fix the position of G and C in case 1B, So this case is eliminated. Now Case 2B is the final arrangement.
