CREATE TABLE table_6144 ("Call sign" CLOB, "Frequency" CLOB, "City of license" CLOB, "Watts" FLOAT, "Class" CLOB)

Which Class has a City of license of garden city, kansas?
SELECT "Class" FROM table_6144 WHERE "City of license" = 'garden city, kansas'
SELECT "Class" FROM "table_6144" WHERE "City of license" = 'garden city, kansas'