By drawing a line longer than that line next to it : it's simple
go to settings and then go to restore default settings then the password should be 9999 or 0000 ^_^
before woods and some other things were used as pencils. even before there weren't any erasers at the top of a pencil before because the teachers felt that the students will make too many scribbling, make mistakes and eraze frome the rubber, and that it is a big waste of time