CREATE TABLE table_73900 ("Institution" TEXT, "Location" TEXT, "Nickname" TEXT, "Founded" FLOAT, "Type" TEXT, "Enrollment" FLOAT, "Joined" TEXT)

which categories fit under the institution calvin college?
SELECT "Type" FROM table_73900 WHERE "Institution" = 'Calvin College'
SELECT "Type" FROM "table_73900" WHERE "Institution" = 'Calvin College'