Rule II.a: Group 2a, strong verbs with pattern "ie-oo-o"

	II.a	Abbreviation:	ie-oo-o (#2a)
		Description:	"ie" for "oo/o" substitution for strong verbs, whose verb primitives end on "ie" and that are followed by one arbitrary consonant.
		Example verb:	3.	bieden (strong verb)
		Application:	-	the verb's verb primitive ends on "ie" and is followed by a consonant.
			-	the "ie" is replaced by a double, respectively single "o", e.g. "wij boden", not "wij biedden".

		Applies for (weak verbs):
			OTT (Present):	-
			OVT (Past):	-
			Imperatief:	-
			Voltooid Deelwoord (Past Participle):	-
		Applies for (strong verbs):
			OTT (Present):	-
			OVT (Past):	Singular I-III (oo), Plural I-III (o)
			Imperatief:	-
			Voltooid Deelwoord (Past Participle):	always (o)
		Example:
			OVT (Past):	weak: "vieren" => "ik vierde", not "ik voor"
			OVT (Past):	strong: "bieden" => "ik bood", not "ik biedde"
		Detection:	Verbtime detects "ie-verbs" automatically as strong verbs. If a verb shall however be built weak/regularly, then it must be included in the list of strong verbs (ignore).

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also see:
Overview - Verb irregularities