[R] a question about data combination

[XinMeng]

Hello sir: 

Here's the data: a b c d 1 2 3 4 

I wanna know how to get: 
ab ac ad bc bd cd 
12 13 14 23 24 34 

Thanks a lot! My best  
 




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Xin Meng 
Capitalbio Corporation
National Engineering Research Center 
for Beijing Biochip Technology 
BioPharma-informatics & Software Dept. 
Research Engineer
Tel: +86-10-80715888/80726868-6438
Fax: +86-10-80726790
Email£ºxmeng at capitalbio.com 
Address:18 Life Science Parkway, 
Changping District, Beijing 102206, China