põhiliisekspõhiliseks
Põhiliisekspõhiliseks is a term that appears to be a portmanteau of two Estonian words. "Põhiline" translates to "main," "basic," or "fundamental." "Liis" is a common Estonian female given name. The suffix "eks" can indicate purpose or destination, and "põhiliseks" is the allative case of "põhiline," meaning "into the main" or "for the main." Therefore, "põhiliisekspõhiliseks" could be interpreted as something akin to "for the main purpose of Liis becoming the main" or "for the main path of Liis."
The exact meaning and context of this phrase are unclear without further information. It is not a