CodeChickenCore is just a library of classes that all ChickenBones mods use. You need to install this if you are going to install any of ChickenBones mods. This goes in the coremods folder.
[1.9.4] CodeChickenCore Mod Download
Download links for other versions:
 
Josh
I use 1.7.10 and when i enter it with chicken core and NEI it doesn’t work ;c
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UR GAY
ASTE
AND UR LEBIAN