How many type of "Imalah" in fact?

Question
Assalamu 'alaykum Warahmatullahi Wabarakatuh,
How many type of "Imalah" in fact?
Jazaakallahu Khairan.
Answer
Wa alaikum assalaam wa rahmatullahi wa barakaatuh
There are two types of imaalah. The lessor imaalah, which is called is also caled al-imaalaah as-sughraa.  In this case the alif is 75% of the sound and the ya' is 25% of the sound. 
The grant imaalah is the second type of imaalah.  In this case the alif consists of 50% of the sound and the ya' makes up the other 50% of the sound.  The sound then a mixture of an alif and a ya'. 
Wa iyyaakum