Pattern Password CM13 bigger than 3x3

[MyerSmith]

I want to use a patter and a strong (boot) password.

My question is how it generate a string password from the patter, so I can use it in SnooperStopper. 3x3 seems easy: 0 1 2 3 4 5 6 7 8 http://resources.infosecinstitute.com/android-forensics-cracking-the-pattern-lock-protection/

But bigger pattern seems to have a other scheme.

https://github.com/omnirom/android_bootable_recovery/commit/7a48a664fd00a188044da348f34cc2e800b8a3fe

How I can generate them ?

[snevas]

3x3 isn't usable in LineageOS 14.1 as well in string form (just tested this). They have a different approach to patterns as 'normal' android.