​ To combine two letters into one letter with Shadda

Idgham letters

يرملون​

​ To combine noun sakinah into one of يرملون with Shadda

Idgham letters :

يرملون​

​1-Idgham with gunnah with the letters

​

يومن ​

2-Idgham without Gunnah with the letters ​​

​

ل ر​

​

َمِن رَبِك​

​we combine noun sakinah into the letter ر

َ​مِرَّبِك