Read the text and determine if the sentence is true (see options at the end):

The crystallographic restriction theorem in its basic form was based on the observation that the rotational symmetries of a crystal are usually limited to 2-fold, 3-fold, 4-fold, and 6-fold. However, quasicrystals can occur with other diffraction pattern symmetries, such as 5-fold; these were not discovered until 1982 by Dan Shechtman.

Sentence: these were not discovered until 1986 by Dan Shechtman
Available options:
 1). Yes;
 2). It's impossible to say;
 3). No;