In the rule “Spells” after

A Power may also require one or more Parameters, indicated by square brackets in its Effect. The options for each Parameter are listed in the corresponding subrule to “Parameters”, each option having a Name and a Multiplier (which may be any positive real number).

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A Parameter may include the Names of otherwise valid options for it in a comma separated list after a dash. (e.g. [Domain - FU, VI, YA]). If it does, the listed options may not be used as an values for that Parameter for that Spell.