, \' J23 When an accused person raises his own version for the first time only during his defence, it raises a very strong presumption that the version is an afterthought and, therefore, less weight will be attached to such version. Therefore, in a contest of credibility against other witnesses, the accused is likely to be disbelieved. This is the approach which the trial court took. We find no fault in it." In the present case, she finally submitted that the prosecution proved its case beyond all reasonable doubt in the court below and that the trial court was on firm ground in convicting the appellant. She implored this Court to dismiss both grounds and to uphold the conviction. We have considered the evidence on record, the judgment appealed against, the sentence passed by the court below, the submissions by both Counsel, together with the authorities cited. The appellant was charged and convicted for the offence of incest contrary to section 159(1) of the Penal Code, Chapter 87 of the Laws of Zambia which provides that: "Any male person who had carnal knowledge of a female person who is to that person's knowledge his grandmother, mother, sister, daughter, granddaughter, aunt or niece commits a felony and is liable, upon conviction for a term of not less than twenty years and may be liable to imprisonment for life."