[R] overlapping moving windows

[matteo_new]

Dear all, 
I have a systematic and spatial organized matrix like this:
 
1   2   3   4   5  6   7  8   9  10 
11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
31 32 33 34 35 36 37 38 39 40

in which every number is a species. 
I would create a moving overlapping window to resample, at different scale,
my plants species data matrix with every possible combination.
In short, I would  obtain an output matrix like this:

resample         species
1                       1
1                      11
1                       2
1                      12
2                       2
2                      12
2                       3
2                      13
3                       3
3                      13
3                       4
3                      14
etc

 
can anybody help?
Cheers 
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