ILC 1 expanded class fd

      fd    hydrocarbons 

fdWu	organic compounds  [organic chemistry]
fd	hydrocarbons
fdaWf	aliphatic hydrocarbons, acyclic hydrocarbons
fda	alkanes, paraffins, saturated hydrocarbons
fdaX  [an]	number of carbon atoms
fdab	methane
fdac	ethane
fdbWc	unsaturated hydrocarbons
fdb	alkenes, olefins
fdba	ethylene, ethene
fdc	alkynes
fdca	acetylene
fdhWm	monocyclic hydrocarbons
fdh	phenyls
fdha	benzene, benzol
fdpWw	fused polycyclic hydrocarbons

or

Facets key
0  under aspect      
1  at time           
2  in place          
3  through process   
4  made of element   
5  with organ        
6  from origin       
7  to destination    
8  like pattern      
9  of kind