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,