Rule X: "v => f" substitution

	X.	Abbreviation:	v => f
		Description:	Substitution of consonant "v" for "f", if the verb primitive ends on consonant "v".
		Example verb:	14.	leven (weak verb)
			15.	graven (strong verb)
		Application:	-	the verb primitive ends on "v".

		Applies for (weak verbs):
			OTT (Present):	Singular I, II, III
			OVT (Past):	all forms
			Imperatief:	always
			Voltooid Deelwoord (Past Participle):	always
		Applies for (strong verbs):
			OTT (Present):	Singular I, II, III
			OVT (Past):	Singular I, II, III
			Imperatief:	always
			Voltooid Deelwoord (Past Participle):	-
		Example:
			OVT (Past):	weak: "leven" => "ik leefde, jullie leefden", not "ik leevde, jullie leevden"
			OVT (Past):	strong: "graven" => "ik graaf, jullie graven", not "ik graav, jullie grafen"
		Detection:	Verbtime detects these verbs automatically.

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also see:
Overview - Verb irregularities