`AssigningSecondaryStructure.assign_secondary_structure`

— Method`assign_secondary_structure(chain_backbones::Vector{Array{T,3}}) where T<:Real`

Given a vector of chain backbones, each represented as a 3-dimensional array of size 3x3xL, this function assigns the secondary structure to each residue.

Returns a vector of vectors of integers, each of which is the secondary structure assignment for the corresponding chain and their respective residues. The integers are encoded as follows:

`1`

: loop; neither helix nor strand.`2`

: helix; α, 3_10, or π.`3`

: strand; part of a β-sheet.