What is the correct assignment of the names of the following aromatic heterocycles? 
Definitions:
Experimental Group
In an experiment, the group of participants that receives the treatment or intervention under investigation, as opposed to the control group.
Random Assignment
Assigning participants to experimental and control groups by chance, thus minimizing preexisting differences between the different groups.
Test Difficulty
The measure of how challenging an examination or a set of questions is, often determined by the proportion of test-takers who answer correctly.
Experimental Group
The group in an experiment that receives the variable being tested, contrasted with a control group that does not.
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