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