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From our chemical bonding analysis , we concluded that the 2D - 3D transition occurs at B ( 6 ) H ( 4 ) ( - ) because the addition of one extra hydrogen atom further destroys the network of the peripheral 2c - 2e B - B sigma - bonding , making planar structures less stable , and because the distorted octahedral structure provides some occupation of all s - and p - AOs of boron , avoiding the presence of any empty atomic orbitals .
 Chemical: B ( 6 ) H ( 4 ) ( - ); Chemical: hydrogen; Chemical: B - B; Chemical: boron
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: B ( 6 ) H ( 4 ) ( - ); Chemical: hydrogen; Chemical: B - B; Chemical: boron