[R] contingency table

[reena]

This is my list.
obs1    obs2    exp1     exp2

3           8          725      875
0           0           58        70
3           7          435      525
10         7          754      910
0           1          145     175

and i want result in contingency table as

obs       3                8
exp    725          875

next table will be

obs    0         0
exp   58       70

and so on... 

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