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