Mixed-Up Map

Label the map of South America below with the country names, not in the usual way, but so that each pair of adjacent labels has exactly 2 or 3 letters in common, except for the two borders indicated, where the labels will have exactly 4 letters in common. Multiple letters are only counted twice if both country names contain the letter twice. For example, GUYANA and PARAGUAY have 5 letters in common: G, U, Y, A, and A.


ARGENTINA
BOLIVIA
BRAZIL
CHILE
COLUMBIA
ECUADOR
FRENCH GUIANA
GUYANA
PARAGUAY
PERU
SURINAME
URUGUAY
VENEZUELA

The solution is here.