need help decoding full adder

[late oyster]

not exactly "decoding" just need help with better visuallizing where inputs and carry values go and what logic gates are there from a poorly made textbook example. (for example a red and blue line for a and b to see where the values go, and text over the logic gates saying which type of logic gate they are)

its hard to tell where the carry in is or if there even is one?

this might help might figure it out on my own with this tbh