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Tests:

Conjugation of kesal (meng-, absolute intransitive, irregular)

root	kesal
	active	involuntary	passive	basic / imperative	emphatic / jussive
active	menyesal	terkesal		kesal	kesallah
locative	menyesali	terkesali	dikesali	kesali	kesalilah
causative / applicative1	menyesalkan	terkesalkan	dikesalkan	kesalkan	kesalkanlah
	causative
active	memperkesal	terperkesal	diperkesal	perkesal	perkesallah
locative	memperkesali	terperkesali	diperkesali	perkesali	perkesalilah
causative / applicative1	memperkesalkan	terperkesalkan	diperkesalkan	perkesalkan	perkesalkanlah

¹ The -kan row is either causative or applicative. With transitive roots it mostly has applicative meaning.
Due to euphony, of which regular mengesal sounds similar to mengasal ← asal, and it is hard to pronounce, the actor forms (except the causative forms) of this verb is suppleted by related etymologically verb sesal.
Some of these forms do not normally exist or are rarely used in standard Indonesian. Some forms may also change meaning.

Conjugation of ubah (meng-, ber-, absolute transitive, irregular alternative forms)

root	ubah
	active	involuntary	passive	basic / imperative	emphatic / jussive
active	mengubah, merubah, berubah	terubah	diubah, dirubah	ubah	ubahlah, rubahlah
locative
causative / applicative1	mengubahkan	terubahkan	diubahkan	ubahkan	ubahkanlah, rubahkanlah
	causative
active	memperubah	terperubah	diperubah	perubah	perubahlah
locative
causative / applicative1	memperubahkan	terperubahkan	diperubahkan	perubahkan	perubahlahkan

¹ The -kan row is either causative or applicative. With transitive roots it mostly has applicative meaning.
Some alternative forms are from rubah, a rebracketing of berubah (not related to rubah "fox").
Some of these forms do not normally exist or are rarely used in standard Indonesian. Some forms may also change meaning.