Each *paraboloid* is usually attached to a diagonal. When a massive rotation of the board occurs, the paraboloids may become detached from the diagonals allowing a reduced-line velocity spiral manoeuvre into any desired station upon which they intersect.

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This is often used to reach MC itself, if MC is declared nominally out-of-bounds.

Due to the complexity of the mathematics involved, a book of paraboloid tables (or digital parabulator) is generally required to use this rule.

[Darren]

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