Compressed Vedanta in four words

This is from Bhagavan Ramana Maharshi's teachings.

deham - Body
naham - na + aham - not I
koham - then what is "I" (ko + aham)
soham - sah + aham = I am that. That I am

So, deham naham koham soham is the four word compressed vedanta.

The right concepts of "I"

I. Shadow
I was a shadow of a cloud trying to find the cause of me.
I realized the reason for the cloud is the power of Sun. If I want to see the reason for me (the shadow) I need to remove the cloud and eventually after removing the cloud "I" did not exist. There is no question of seeing the source and the seen. All became one.

II. Lump of Salt
I was a salt doll searching the roots of me and finally got into the ocean to see the depth of it. And eventually became one with the ocean there is no doll, no finding the source and no individual existence.

III. From Atma Bodha
Nirguno Nishkriyo Nityo Nivikalpo Niranjanaha
Nirvikaro Nirakaro Nityamuktosmi Nirmalaha

Asmi - "am" or "Being"

Nirguno - Not having Qualities/Attributes - Satwa, Rajas & Tamas
Nishkriyo - Not assuming ownership for the result of actions - Action less
Nityo - Not bound by the time past, present and future - Eternal
Nirvikalpo - Not having desire and thought - non-discursive
Niranjanaha - Free from falsehood - Truth
Nirvikaro - Not having Vikaras or change like birth, growth, decay and death - Unchanging
Nirakaro - Not having any form - Formless
Nitya Mukto - Ever liberated - Unbound
Nirmala - Not having any dirt - Ever Pure

IV. Mahavakya
Aham Brahma Asmi
I am Brahma

Aham = A is the first letter and HA is the last AHAm = From the beginning to the end - Which is ever existed.
Brahma = the source, platform and the end of all