Add six pi bonds to the structure below to produce the most stable isomer. 
Definitions:
Reliability
The degree to which an assessment tool produces stable and consistent results over repeated applications.
Twin Study
A research method in behavioral genetics that compares the similarity between monozygotic (identical) and dizygotic (fraternal) twins to estimate the genetic contribution to traits and disorders.
Bipolar Disorder
A psychological disorder identified by significant mood swings, encompassing both periods of high emotion (either mania or hypomania) and episodes of depression.
Monozygotic Twins
Identical twins that develop from a single fertilized egg, sharing 100% of their genes.
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