Table: how_its_made_episodes_21
Columns: series_ep
episode
netflix
segment_a
segment_b
segment_c
segment_d

Question: Which Series Ep has a Netflix of s08e18?
SQL: SELECT "series_ep" FROM how_its_made_episodes_21 WHERE "netflix" = 's08e18'

Question: Which Segment B has a Segment D of stone wool insulation?
SQL: SELECT "segment_b" FROM how_its_made_episodes_21 WHERE "segment_d" = 'stone wool insulation'

Question: Which Segment A has a Segment C of poster restoration?
SQL: SELECT "segment_a" FROM how_its_made_episodes_21 WHERE "segment_c" = 'poster restoration'

Question: Which Segment C has a Segment B of fish food?
SQL: SELECT "segment_c" FROM how_its_made_episodes_21 WHERE "segment_b" = 'fish food'

Question: Which Segment C has a Netflix of s08e16?
SQL: SELECT "segment_c" FROM how_its_made_episodes_21 WHERE "netflix" = 's08e16'