It is believed to be extremely narrow, and has at least one pueblo, of Christianized tagalog - the famous Palanan, the scene of Aguinaldo's capture.
"The Bontoc Igorot"
Albert Ernest Jenks
Christian Ilokano from the west coast of northern Luzon and the Christian tagalog from Manila and vicinity were the soldiers.
"The Bontoc Igorot"
Albert Ernest Jenks
I have also seen it used many times in Manila by tagalog who were caught out in a storm without an umbrella.
"The Bontoc Igorot"
Albert Ernest Jenks