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square roots elections dominos range functions sequences menace rugby mean parabolas volume digits cryptic crossnumbers logic trigonometry sums probabilty square numbers perfect numbers perimeter surds palindromes unit fractions partitions scales number wordplay multiples regular shapes angles products graphs balancing taxicab geometry routes odd numbers complex numbers cube numbers books the only crossnumber remainders geometry symmetry circles people maths algebra crosswords bases chocolate percentages squares multiplication dates median area triangles shapes hexagons arrows ave prime numbers numbers coins floors tiling christmas dodecagons star numbers 3d shapes games rectangles grids chalkdust crossnumber advent planes factors fractions cryptic clues time 2d shapes cards speed proportion polygons lines sum to infinity division dice ellipses coordinates gerrymandering quadratics differentiation crossnumbers folding tube maps pascal's triangle means triangle numbers sport crossnumber shape clocks probability addition money colouring integration calculus integers indices factorials chess averages digital clocks spheres doubling irreducible numbers