"Thank you, kindly!" said Xercis emulating Josh. She began to tie all the wires into complicated knots. From her pocket she took out a piece of paper. On it were simple middle school math problems. Cerxis tied lots of knots in the wires until it looked like she was making bracelets. But instead, she unwove the wire when she was done. "I am finished!" she said at last. "Can you look?" she asked holding up the piece of paper. "This is... 'multiplication'? This is 'division'?"