How many KEI catagories are listed when the economic incentive regime is 2.56? 
CREATE TABLE table_23050383_1 (kei VARCHAR, economic_incentive_regime VARCHAR)
SELECT COUNT(kei) FROM table_23050383_1 WHERE economic_incentive_regime = "2.56"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_23050383_1 (kei VARCHAR, economic_incentive_regime VARCHAR) Question: How many KEI catagories are listed when the economic incentive regime is 2.56?  [/INST] SELECT COUNT(kei) FROM table_23050383_1 WHERE economic_incentive_regime = "2.56" </s>