Explanation of diagram results:
Each beneficiary gets an equal share. Here, there are 20 beneficiaries (C, 1,2,4,5,6,7,9,a,b,c,d,e,f,g,h,I,j,k,l). So, they each get 1/20.
Since A predeceased with no issue, each child is entitled to ¼ of the estate. Only C is alive to take his share. B, D and E will each have their ¼ share go to their issue. For B, that means 1 and 2 (3 predeceased with no issue, so 3 is out of the equation). So, 1 and 2 share B’s ¼, so they each get 1/8. D’s ¼ goes to 6, because 6 is B’s only child. E’s ¼ is split among 7,8 and 9. So, 7,8 and 9 would each be entitled to 1/3 of E’s 1/4 , or 1/12 overall. 7 and 9 take their 1/12, but 8 is not around, so her 1/12 is split among j and k, who each take 1/24.
Since A predeceased with no issue, each child is entitled to ¼ of the estate. Only C is alive to take his share. 1,2,6,7,8 and 9 all step in as beneficiaries because their parents are dead. Per representation works so that they split equally the shares that are left over. Since C got ¼, there are ¾ left over for 1,2,6,7,8 and 9. So, each of them would be entitled to 1/5 of the 3/8, or 1/8 of the estate. Since 8 is dead, his 1/8 does to j and k, who would each get 1/16.