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