How many vertices in the graph below have odd valences? 
Definitions:
Decatastrophize Technique
A cognitive-behavioral therapy technique aimed at reducing anxiety by challenging and modifying catastrophic thoughts.
Overestimating
The cognitive bias of appraising a situation or an outcome as being more likely or significant than it actually is.
Beck's Cognitive
A therapeutic approach developed by Aaron T. Beck, focusing on identifying and challenging negative thinking patterns to treat psychological disorders.
Depression
A mental health disorder characterized by persistently depressed mood or loss of interest in activities, causing significant impairment in daily life.
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