Disclosed is a system for detecting an acute myocardial infarction at the earliest possible time and promptly warning the patient that he should immediately seek medical care. A method for correcting a query includes determining whether a query is a wrong query, correcting the query on a per-whole-query basis, and correcting the query on a per-word basis. The dispensing outlet is at a height below the height of the sump outlet and fluid to exit the sump flows from the sump outlet upwardly in a first portion of the passageway to a height above the sump outlet then downwardly to the dispensing outlet. Said apparatus necessarily includes electrical circuitry to maintain a steady-state electrical charge on the aforementioned specially shaped electrodes. The second codebook is a codebook for transmission antennas which are a multiple of an integer of the plurality of transmission antennas, and a precoding matrix included in the second codebook is generated by a combination of precoding matrices included in the first codebook.