You do not understand correctly. The placement of the dots is meaningless - only the fact that they exist matters. • means the word contains a character that is correct AND is in the right place ○ means the word contains a character that is correct •○ means that the word contains two characters tha...

Don't have the book with me, need a clue as to which one this is.

It's a logic puzzle. Fill in the blank spaces the the keys. The dots indicate whether the characters are correct (in terms of the answer), but are not indicative of position themselves. The answer has six spaces, so there can only be six characters in it. That means only six characters across all o...