<Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 30 </Td> <Td_colspan="1"> June 6, 2011 (2011 - 06 - 06) </Td> <Td> October 22, 2012 (2012 - 10 - 22) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 21 </Td> <Td_colspan="1"> January 7, 2013 (2013 - 01 - 07) </Td> <Td> August 19, 2013 (2013 - 08 - 19) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 22 </Td> <Td_colspan="1"> January 13, 2014 (2014 - 01 - 13) </Td> <Td> December 8, 2014 (2014 - 12 - 08) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 20 </Td> <Td_colspan="1"> January 6, 2015 (2015 - 01 - 06) </Td> <Td> October 26, 2015 (2015 - 10 - 26) </Td> </Tr>

How many episodes in season 3 of switched at birth