El camino Inca because the sentences says the indigenous cultural route (la ruta indigena cultural) is a road that the ancient indians "los incas" occupy to move from one to one place to another.
ER endings are:
Yo-o
Tu-es
El/Ella-e
Nosotros-Emos
Vosotros-eis
Ellos/ellas- en
Sudoku should mean that you can’t have the same ending in a row, column, or box
