P4,M1,M2,M3,Estimated age,% ,,a,,15?26 months,44 ,g,d,,15?26 months, ,g,,,15?26 months, ,,,a,15?26 months, ,,,c,26?36 months,22 ,,,f,26?36 months, f,l,k,,3?6 years,33 ,,,g,3?6 years, ,,,g,3?6 years,