can anyone suggest a next sudoku move?

I'm stuck on this sudoku - see picture.

Please can someone explain a strategy to make my next move?
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ProgrammerAuthor Commented:

(Here is the image)
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Commented:
Top left is 7
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Commented:
A few suggestions:
Top row middle has "36" as does the center box.  This makes the second row middle (368) just an 8.  This also puts an 8 in the third row, eighth column.  That will cause more results in the bottom-right cube.  I suspect that you can solve the puzzle from there.

3,6, and 8 should be removed from the "penciled-in" area in the center column, last two rows.  Similarly, remove the 6 from the first row, second column and the first row eighth column.

I believe that a penciled-in 2 belongs in row 3, column 2.

I don't see the "top left is 7", but I could easily be missing something.
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Commented:
row 3, column 3 is 9
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ProgrammerAuthor Commented:
Just to repeat - I can't accept suggestions that don't have an explanation - I want to understand why you are making the suggestion.

CompProv - yes, good point if two squares in the same row or column just have the same two numbers I can remove those numbers from other squares in that row or column, and that is true for 36 in the centre column, and also the top row.

You are right about the missing 2 - I was just trying out some x-wing strategy and think I left it removed by mistake, I'm sure it was there as I had been over the puzzle a few times...

Thanks!
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ProgrammerAuthor Commented: