Question number 1)d) in August 27, 2019 paper.

Convert ZDD to FDD.

I got the following set representation : {a,b,c}, {b}, {a,c}

Then after expansion to RMNF and cancelling out common terms,

I got the following CDNF : a&b&c | a&b&!c | a&!b&c | !a&b&c | !a&b&!c

After decomposition I got the following FDD :

But According to the solution, there is an extra outgoing edge from the left c to 0.

What am I missing here?

Also, Is it possible for a node to have more than 2 outgoing edges?

The solution image :