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S=1 □ 2 □ 3 □ 4 □ 5 □ 6 □ 7 □ 8 □ 9 □ 10S=1\, \square \, 2 \, \square \, 3 \, \square \, 4 \, \square \, 5 \, \square \, 6 \, \square \, 7 \, \square \, 8 \, \square \, 9 \, \square \, 10 S=1□2□3□4□5□6□7□8□9□10
Is it possible to insert either a + + + or − - − sign in each box to make S=0S=0S=0?
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