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can i use this pack commercially? 

Yes you can.  Special thanks to Teddyoh and the others who have worked on this asset!

From the license file:

 EVerything in his package is licensed CC0 as linked below.  

 License (Creative Commons Zero, CC0)
 Everything in this package is for both personal and commercial usage.
 Credit to the creator (Teddyoh) would always be appreciated, not a necesity though.
 The content was created for use with Kenney's ( AssetForge and for any product made
 in AssetForge would have to be in line with the License for AssetForge.