2+2=

(a)  

4+4=

(a)  

8+8=

(a)  

16+16=

(a)  

32+32=

(a)  

64+64=

(a)  

128+128=

(a)  

256+256=

(a)  

512+512=

(a)  

1024+1024=

(a)  

2048+2048=

(a)  

4096+4096=

(a)  

8192+8192=

(a)  

16384+16384=

(a)