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Table 1 General format of the fragment dictionary (AT = Atom Type, BT = Bond Type).

From: A constructive approach for discovering new drug leads: Using a kernel methodology for the inverse-QSAR problem

Type ID General Fragment Type Atom Count
1) AT BT AT 2
2) AT BT AT BT AT 3
3) AT BT AT BT AT BT AT 4
4) AT BT AT BT AT 4
            BT  
            AT