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insert(l:List|Vector,i:ZZ,x)

insert({l1,…,ln},i,x)={l1,…,li-1,x,li,…,ln}insert([v1,…,vn],i,x)=[v1,…,vi-1,x,vi,…,vn]where 1<=i<=length(l)+1







insert(p:Polygonal|Polygon,i:ZZ,A:Point)

polygonal(P1,...,Pi-1,A,Pi,...,Pn) where n=length(P), 1<=i<=n+1





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