Table: northern_lakes_conferences
Columns: school
location
mascot
size
ihsaa_class
county
year_joined
previous_conference

Question: What is the size of the team that was previously from Central Indiana conference, and is in IHSSA Class 4a?
SQL: SELECT "size" FROM northern_lakes_conferences WHERE "ihsaa_class" = '4a' AND "previous_conference" = 'central indiana'

Question: What is the IHSAA class for the team located in Middlebury, IN?
SQL: SELECT "ihsaa_class" FROM northern_lakes_conferences WHERE "location" = 'middlebury, in'