Explain formula [Closed]

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10
Registration date
Tuesday December 1, 2015
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Last seen
July 10, 2018
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Hi, please can anyone explain what excactly does this formula?
=INDEX(Sheet1!$A$2:$A$13,SMALL(IF(FREQUENCY(MMULT(--(Sheet1!$B$2:$B$13={"jan","feb","mar"}),{1;1;1})*(Sheet1!$A$2:$A$13),MMULT(--(Sheet1!$B$2:$B$13={"jan","feb","mar"}),{1;1;1})*(Sheet1!$A$2:$A$13))>1,ROW(Sheet1!$A$2:$A$13)-ROW($A$1)+1),ROWS($A$1:A1)))