factor: Format is '%f i' or '-f i'
In incorrect format was specified in a Factor switch definition.
The correct syntax is
Factor:{%percent │ -constant} [count]
<percent> Percentage between 0 and 100 to reduce friction.
<constant> Constant value between 0 and 65,535 to reduce friction.
<count> Interval between reductions of friction.
See: Factor
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