It is of unclear origin, with two main traditions having evolved in different parts of the world.

There is the third feature near 2.3 μm of unclear origin.

The name is of unclear origin, although the initial F- indicates a German origin.

An opening of unclear origin is located in the sail, approximatively 2.5 metres above the ground.

Nevertheless despite its unclear origin, the story is a popular children folktale in both Indonesia and Malaysia.

The name is derived from *Boxyn'ь, which is of unclear origin.

The name of the area, first appearing as the village of Mokotowo in documents from the year 1367, has unclear origins.

In early 2005, Gross faced a scandal related to unclear origins of the loan to buy his flat.

It is served in the central United States and of unclear origins.

One study had shown the Allegheny group to be a mix of white, black, and Native American blood with unclear origins.