diff --git a/wani.py b/wani.py
index 80bcd8d..cb6ece8 100644
--- a/wani.py
+++ b/wani.py
@@ -430,6 +430,19 @@ def get_level(restriction):
     raise RuntimeError("Unreachable!")
 
 
+def determine_ppb(rgx):
+    if rgx[0] in ("A", "N", "R"):
+        return 0
+    elif rgx[0] == "V":
+        if 'a' in rgx[1]:
+            return 3
+        elif 'm' in rgx[1]:
+            return 1
+        else:
+            return 2
+    else:
+        return 4
+
 def build_morphology_regex(restriction):
     restr_dict = {}
     for feature in restriction:
@@ -494,6 +507,8 @@ def build_lexis_regex(restriction):
 
 class Restriction:
     def __init__(self, restriction_tag):
+        self.ppb = 4 # polnopomenska beseda (0-4)
+
         if restriction_tag is None:
             self.type = RestrictionType.MatchAll
             self.matcher = None
@@ -505,6 +520,8 @@ class Restriction:
             self.type = RestrictionType.Morphology
             present, self.matcher = build_morphology_regex(list(restriction_tag))
             self.present = " ".join(present)
+            self.ppb = determine_ppb(present)
+
         elif restriction_type == "lexis":
             self.type = RestrictionType.Lexis
             self.present, self.matcher = build_lexis_regex(list(restriction_tag))
@@ -711,7 +728,28 @@ class SyntacticStructure:
 
         fake_root_component = Component({'cid': '#', 'type': 'other'})
         st.components = fake_root_component.find_next(deps, comps, restrs, forms)
+
+        st.determine_core2w()
         return st
+    
+    def determine_core2w(self):
+        ppb_components = []
+        for c in self.components:
+            if c.type != ComponentType.Core:
+                continue
+
+            ppb = 4
+            for r in c.restrictions:
+                ppb = min(r.ppb, ppb)
+
+            ppb_components.append((c, ppb))
+
+        ppb_components = sorted(ppb_components, key=lambda c: c[1])
+        if len(ppb_components) > 2 and ppb_components[1][1] == ppb_components[2][1]:
+            raise RuntimeError("Cannot determine 2 'jedrna polnopomenska beseda' for", self.id)
+
+        for c, _ in ppb_components[:2]:
+            c.type = ComponentType.Core2w
 
     def add_representation(self, n, rep_el, forms):
         assert(rep_el.tag == "representation")