your research traced the did that ix of the corona virus backwards reisa and the like you might be able to do with a person or a species. i suppose. what we were able to conclude by doing that. we get the data from the beginning of the 1st song, pulls in december 2019 up to the end of february 2020. and then we constructed a well, it's like a complex tree. so a combination of trees to find out how the virus had developed. and we identified 3 types which we called a b. and c. . and comparing these types with the back coronavirus, we saw that the a type was the most ancient, and b. was a bit younger, and c. was the most recent ricer. we have these 3 phases of the corona virus. where do we find those around the world? are they or are they everywhere? well, the a.b.c. types are all represented in china and in east asia. but we see a type that even penetrating 2 to europe, a stray here and north america. and then later, the b. type takes over. so that happens in march and april. so it has developed by mutation, a more infectious type, which is then taken over the world in the course of march