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<http://schema.org/description>
"Mathematical mind reading tricks are a great way to combine your mastery of math with a bit of magical fun. You ask the spectator to pick a number from 0 to 9 in his/her head. Later on after some steps they pick another number from 0 to 9...."
<https://www.wikihow.com/Do-a-Cool-Mathematical-Mind-Reading-Trick>