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  • where 'current' value of most recent date (31 jan) of maker+model+class = previous 'current' of same maker+model+class , then TRUE
  • where 'current' value of most recent date (31 jan) of maker+model+class <> previous 'current' of same maker+model+class , then FALSE
  • if FALSE, then compare against previous 'new' value.. if they are the same then TRUE, if not, then FALSE
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