Please help with my save door

[Dr. Boom]

Please help with my Safe-Door

Moin moin =)

Dudes I have a little problem here. Actually its pretty simple .. I just need to open up a safe-door by using the correct combination of numbers.
In addition a small note, I found in some house should help me to to this.

Sounds simple but hell I don't have any idea and I'm trying it how long now and I still don't get it.
So I thought maybe some girls or guys out there knows how to handle this. If you have a solution then please write how you get it, because I want understand it too okay?

So here we have the safe-door.

and here we have the note.

Again I really hope some people know this, else I can't continue my way to the truth =(

Greetings and Peace
Dr. Boom

 

[Dr. Boom]

Moin moin =)

Okay first of all I don't really care about this double post but I thought it's bit stupid to edit it, because I solve this little puzzle and wanna share it with you!

Don't look at it until you really don't know how it works!!!!!!

Line 1: There you see "1" - means you have "one 1" so you type "1 1" (stands in line 2)

Line 2: There you see "1 1" - means you have "two 1" so you type "2 1" stands in line 3)

Line 3: There you see "1 2 1 1" - means you have "one 1, one 2, two 1" so you type "1 1 1 2 2 1 (stands in line 4)

Lane 4: There you see "1 1 1 2 2 1" - means you have " three 1, two 2, one 1" so you type " 3 1 2 2 1 1" - which is the code for the door.

Well at the end pretty simple. but first you need to get that - so don't know if someone thought about it, but if then thanks for at least trying to help me or just try to find it out yourself.

Greetings and Peace
Dr. Boom

 

[Magtheridon96]

Ah, I've come across this riddle thrice in my life
I don't know why I keep forgetting how to solve it.

 

[The Reborn Devil]

Pffft, brute force is the best.

 

[Sin'dorei300]

Use magic!