Verb-irregularities, rule VI (ff,f)

VI.	Abbreviation:	(ff, f), (ll, l), (mm, m), (tt, t) - avoiding double consonants

	Description:	Avoiding double consonants for strong verbs, that end on "ff", "ll", "mm" or "tt"

	Example verb:	9.	schaffen (Partizip II: rule does not apply)
			bitten (Partizip II: rule applies for "tt"-verbs)

	Application:	-	only valid for strong verbs
		-	the verb primitive ends on "ff", "ll", "mm" or "tt"
		-	the Indikativ Präteritum and Konjunktiv II (Präteritum) as well as Partizip II (only for tt) leave out an "f", "l", "m" respectively "t"

Applies for (weak verbs):
	Präsens:	-
	Präteritum:	-
	Konj II (Prät):	-
	Imperativ:	-
	Partizip:	-

Applies for (strong verbs):
	Präsens:	-
	Präteritum:	all forms
	Konj II (Prät):	all forms
	Imperativ:	-
	Partizip:	only for verbs ending on "tt"

Example:
	Präteritum:	"du schufst", not "du schuffst"
	Partizip II:	"schaffen" => "geschaffen", not "geschafen"
	Compare:	"bitten" => "gebeten", not "gebetten"