Rule I: e1, e-insertion

	I.	Abbreviation:	e1
		Description:	e-insertion for verbs, whose verb primitive ends on "d" or "t"
		Example verb:	4.	reden (weak verb)
				braten (briet, gebraten) (strong verb)
		Application:	-	the verb primitive ends on "d" or "t"
			-	all verb extensions that start with a consonant, receive an additional "e" in order to avoid building of double consonants (e.g. "du redest", not "du redst" or "ihr redet", not "ihr redt").

		Applies for (weak verbs):
			Präsens:	Singular II, Singular III, Plural II
			Präteritum:	all forms
			Konj II (Prät):	all forms
			Imperativ:	Singular II, Plural II
			Partizip:	always
		Applies for (strong verbs):
			Präsens:	Singular II, Singular III, Plural II
			Präteritum:	-
			Konj II (Prät):	-
			Imperativ:	Singular II, Plural II
			Partizip:	-
		Example:
			Präteritum:	weak "reden" => "du redetest", not "du redtest"
			Präsens:	strong "braten" => "du brietest", not "du brietst"

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also see:
Overview - verb-irregularities