Hello Charles and other Users,

I am doing rigid body modeling based on a crystal structure and have a question 
about the atom selection. There are 10 individual chains named A to J.
I wanted to fix all atoms of chain A, B and C, and the backbone of chain D, 
residues 50-60.
I am not sure if the following expression would do it.

((segid A and resid 1:100) or (segid B and resid 1:100) or (segid C and resid 
1:100)) and (name C* or name O* or name N* or name S* or name H*)) or ((segid D 
and resid 50:60) and (name C or name CA or name N or name O or name HN or name 
HA*))

I am not sure if this is the correct use of 'or' and 'and' in the expression. 
Thank you very much for any suggestion.

Best regards,
Qi
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