Rule XIII: "e-ee substitution"

	XIII	Abbreviation:	e-ee
		Description:	-	Duplication of the verb primitive's final vocal "e" for "elen/eren/enen" verbs, that hold none or more than further vocal in their verb primitive's.
			-	For elen/eren/enen verbs it is first checked how many further vocals the verb contains, after the verb ending elen/eren/enen has been cut off. For example: "spelen" => "sp-elen" => "sp" has no further vocals "klapperen" => "kl-a-pp-eren" => "kl-a-pp" has one further vocal "exporteren" => "e-xp-o-rt-eren" => "e-xp-o-rt" has two further vocals vocals, that are contained in a non-separable verb prefix, are not counted (e.g. "onteren" (ont-eren)). In case of "onteren" the verb doesn't have a further vocal, as it contains only of the non-separable verb prefix and the verb ending "eren" itself.
			-	If now the verb has exactly one further vocal, then the "e" from elen/eren/enen does not get doubled, the accentuation remains short on the verb primitive, e.g. "klapperen" => "ik klapperde", not "ik klappeerde". If however the verb "does not have one further vocal" (means it has more than one vocal or none at all), then the "e" from elen/eren/enen gets doubled, the accentuation becomes long, e.g. "decoreren" => "ik decoreerde", not "ik decorerde" or "spelen" => "ik speelde", not "ik spelde". Accordingly the verb with non-separable verb prefix "onteren": Since there is no further vocal, the "e" from "eren" gets doubled to "ik onteerde", not "ik onterde".
			-	Note: The rules here do not match to 100%. Thus you can include verbs that need to be built against these rules in one of the two lists elen/eren/enen-short and elen/eren/enen-long and by that instruct Verbtime to build the verbs accordingly.
			-	Note: For strong verbs these rules do only apply for the OTT (Present) and Imperative, as the OVT (Past) and Voltooid Deelwoord (Past Participle) are built strongly, e.g. "bevelen" => "ik beveel" and "beveelt u!", but "ik beval", not "ik beveelde" and "bevolen", not "beveeld".
		Example verb:	19.	repareren
		Application:	-	elen/eren/enen verbs that have none or more than one vocal in their verb primitives
			-	Duplication of the verb primitive's last vocal
			-	also see: Duplication of the vocal for verbs with only one vocal followed by one consonant

		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):	never (as strong conjugation)
			Imperatief:	always
			Voltooid Deelwoord (Past Participle):	never (as strong conjugation with "en")
		Example:
			OVT (Past):	weak: "repareren" => "ik repareerde", not "ik reparerde"
		Detection:	Verbtime detects these verbs automatically, verbs that are built differently to these rules can be defined in the two lists elen/eren/enen-short and elen/eren/enen-long.

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also see:
Overview - Verb irregularities