Identify the local molecular geometry and hybridization at atoms a and b in Ritalin, which is a drug used to treat attention deficit hyperactivity disorder. In the line drawing shown below, the hydrogen atoms bonded to carbon are not shown explicitly. 
Definitions:
Luggage Recovery
The process of locating and returning lost or misplaced bags to their rightful owners by airlines or airports.
Airline
A company that provides air transport services for traveling passengers and freight.
Consumer Group
A collection of individuals or households that share similar purchasing behaviors or characteristics.
Z-scores
Standardized scores that indicate how many standard deviations an element is from the mean, used in statistics for comparisons between different data sets.
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