Table: org_structure
Columns: president
treasurer
secretary
social_ao
academic_ao
internal_co
external_co

Question: What Secretary has a Social AO of lieke de boer?
SQL: SELECT "secretary" FROM org_structure WHERE "social_ao" = 'lieke de boer'

Question: What Social AO has an External CO of elena buscher, and a President of harm van leeuwen?
SQL: SELECT "social_ao" FROM org_structure WHERE "external_co" = 'elena buscher' AND "president" = 'harm van leeuwen'

Question: What Social AO has an External CO of simonas savickas, and an Internal CO of pieter kuijsten?
SQL: SELECT "social_ao" FROM org_structure WHERE "external_co" = 'simonas savickas' AND "internal_co" = 'pieter kuijsten'

Question: What Secretary has an Internal CO of isabel voets?
SQL: SELECT "secretary" FROM org_structure WHERE "internal_co" = 'isabel voets'

Question: What Academic AO has a President of harm van leeuwen?
SQL: SELECT "academic_ao" FROM org_structure WHERE "president" = 'harm van leeuwen'

Question: What Social AO has a President of harm van leeuwen?
SQL: SELECT "social_ao" FROM org_structure WHERE "president" = 'harm van leeuwen'