Hi R user,
I could not combine two tables. Would any one help me on how I can combine with 
following example tables?

> T1
  X Y  Z XX
A 1 5  9 13
B 2 6 10 14
C 3 7 11 15
D 4 8 12 16

> T2
   X Y XX
a 1 4  7
b 2 5  8
c 3 6  9

I want to get the following table 
cT
   X Y XX
A 1 5  13

B 2 6  14

C 3 7 15
D 4 8 16
A1 1 4  7

B1 2 5  8

C1 3 6  9

Thanks for your help.
Thanks,
Kristi
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