S. 276CC : Offences and prosecutions-Failure to furnish return of income-Proven to be non-wilful and caused by circumstances beyond assessee’s control-The statutory presumption of culpable mental state under section 278E stood rebutted-Vitiating foundation necessary for conviction under section 276CC and justifying acquittal-Onus on assessee to establish beyond reasonable doubt that failure was not intentional-Acquittal by session judge was proper-Mere setting aside of penalty under section 271(1)(b) by an appellate authority does not, by itself, vitiate prosecution under section 276CC. [S. 132, 153A, 278E, Criminal Procedure Code, 1973, S. 378]