Abetment of imprisonment punishable offences: liability exists even if offence not committed, punishable by reduced imprisonment or fine. Where an offence punishable with imprisonment is not committed as a consequence of abetment and no express punishment for such abetment is provided, the abettor is punishable by imprisonment of the same description for a term up to one fourth of the longest term provided for that offence, or by the fine provided for that offence, or by both; if the abettor or the person abetted is a public servant whose duty is to prevent the offence, the maximum reduced term rises to one half of the longest term, or the prescribed fine, or both.