Leen letters (SOFT letters)
When there is a letter with Fathah 'a' and next letter is ya saakin , it produces 'ay' sound (some cases 'ai'). This is called 'Ya Leen' or 'soft Ya'
When there is a letter with Fathah 'a' and the next letter is waw (with or without saakin)it produces 'ow' sound ('au' some cases).
This is called waw Leen or 'soft waw'