How many Bahos are there?

Hint 1 of 5:

Have you read the special book in the library about masks?

Hint 2 of 5:

Make a note about each one.

Hint 3 of 5:

It may help to draw the different symbols.

Hint 4 of 5:

Have you placed any in the Kiva altar?

Hint 5 of 5:

Count the number of empty slots in the altar and notice the symbols under
each hole.