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  1. or download this
    NOT( A OR B ) <==> NOT(A) AND NOT(B)
NOT( A AND B ) <==> NOT(A) OR NOT(B)
  2. or download this
    NOT( ($odometer[$wheel] < 9 || $wheel < 0) ) 
==>
NOT($odometer[$wheel] < 9 ) AND NOT ($wheel < 0) 
==> 
$odometer[$wheel] >= 9 AND $wheel >= 0