constexpr std::array<std::pair<std::uint32_t, std::uint32_t>, 18> connections
{ {
{ 6, 5 },
{ 5, 4 },
{ 4, 3 },
{ 3, 2 },
{ 2, 1 },
{ 1, 0 },
{ 4, 8 },
{ 8, 9 },
{ 9, 10 },
{ 4, 13 },
{ 13, 14 },
{ 14, 15 },
{ 0, 22 },
{ 22, 23 },
{ 23, 24 },
{ 0, 25 },
{ 25, 26 },
{ 26, 27 },
} };