What is the frequency of trains numbered 12671/12672?
CREATE TABLE table_21716139_1 (frequency VARCHAR, train_no VARCHAR)
SELECT frequency FROM table_21716139_1 WHERE train_no = "12671/12672"
### Context: CREATE TABLE table_21716139_1 (frequency VARCHAR, train_no VARCHAR) ### Question: What is the frequency of trains numbered 12671/12672? ### Answer: SELECT frequency FROM table_21716139_1 WHERE train_no = "12671/12672"