[Excel]index+match+match(matrix lookup with no limitation)

= INDEX ( array , row_number , column_number )
= MATCH ( lookup_value , lookup_array , 0 )


= INDEX ( entire matrix , MATCH ( vertical lookup value,  entire left hand lookup column , 0 ) , MATCH ( horizontal lookup value , entire top header row , 0 ) )

from http://www.mbaexcel.com/excel/how-to-use-index-match-match/