[['call sign', 'frequency mhz', 'city of license', 'facility id', 'erp w', 'height m ( ft )', 'class', 'fcc info'], ['kzth', '88.5', 'piedmont , oklahoma', '83880', '50000', '-', 'c1', 'fcc'], ['kthf', '89.9', 'hammon , oklahoma', '177198', '26500', '-', 'c2', 'fcc'], ['kxth', '89.1', 'seminole , oklahoma', '85076', '2600', '-', 'a', 'fcc'], ['kthl', '89.3', 'altus , oklahoma', '85076', '1500', '-', 'a', 'fcc'], ['k276ex', '103.1', 'oklahoma city , oklahoma', '145396', '75', '-', 'd', 'fcc'], ['k261dp', '100.1', 'edmond , oklahoma', '83195', '92', '-', 'd', 'fcc'], ['k253ay', '98.5', 'norman , oklahoma', '148125', '25', '-', 'd', 'fcc'], ['k261dr', '100.1', 'wichita , kansas', '14455', '250', '-', 'd', 'fcc'], ['k289au', '105.7', 'bartlesville , oklahoma', '153233', '250', '-', 'd', 'fcc'], ['k290bp', '105.9', 'stillwater , oklahoma', '51938', '250', '-', 'd', 'fcc']]
only 2 of the Call Sign have a as their listed Class
only 2 of the [ENT] have a as their listed [ENT]