diff --git a/src/kyupy/logic.py b/src/kyupy/logic.py
index 97446a5..d30fd55 100644
--- a/src/kyupy/logic.py
+++ b/src/kyupy/logic.py
@@ -287,23 +287,6 @@ def bp_not(out, inp):
 
 
 def bp_or(out, *ins):
-    # 4-valued:
-    #    0 1 - X
-    # 0  0 1 X X
-    # 1  1 1 1 1
-    # -  X 1 X X
-    # X  X 1 X X
-
-    # 8-valued:           o[0]:            o[1]:            o[2]:
-    #    0 1 - X R F P N  0 1 - X R F P N  0 1 - X R F P N  0 1 - X R F P N
-    # 0  0 1 X X R F P N  0 1 1 1 0 1 0 1  1 0 1 1 0 1 1 0  0 0 0 0 1 1 1 1
-    # 1  1 1 1 1 1 1 1 1  1 1 1 1 1 1 1 1  0 0 0 0 0 0 0 0  0 0 0 0 0 0 0 0
-    # -  X 1 X X X X X X  1 1 1 1 1 1 1 1  1 0 1 1 1 1 1 1  0 0 0 0 0 0 0 0
-    # X  X 1 X X X X X X  1 1 1 1 1 1 1 1  1 0 1 1 1 1 1 1  0 0 0 0 0 0 0 0
-    # R  R 1 X X R N R R  0 1 1 1 0 1 0 0  0 0 1 1 0 0 0 0  1 0 0 0 1 1 1 1
-    # F  F 1 X X N F F F  1 1 1 1 1 1 1 1  1 0 1 1 0 1 1 1  1 0 0 0 1 1 1 1
-    # P  P 1 X X R F P N  0 1 1 1 0 1 0 1  1 0 1 1 0 1 1 0  1 0 0 0 1 1 1 1
-    # N  N 1 X X R F N N  1 1 1 1 0 1 1 1  0 0 1 1 0 1 0 0  1 0 0 0 1 1 1 1
     md = out.shape[-2]
     for inp in ins: assert md == inp.shape[-2]
     out[...] = 0
@@ -329,23 +312,6 @@ def bp_or(out, *ins):
 
 
 def bp_and(out, *ins):
-    # 4-valued:
-    #    0 1 - X
-    # 0  0 0 0 0
-    # 1  0 1 X X
-    # -  0 X X X
-    # X  0 X X X
-
-    # 8-valued:
-    #    0 1 - X R F P N
-    # 0  0 0 0 0 0 0 0 0
-    # 1  0 1 X X R F P N
-    # -  0 X X X X X X X
-    # X  0 X X X X X X X
-    # R  0 R X X R R P R
-    # F  0 F X X R F P F
-    # P  0 P X X P P P P
-    # N  0 N X X R F P N
     md = out.shape[-2]
     for inp in ins: assert md == inp.shape[-2]
     out[...] = 0xff
@@ -372,23 +338,6 @@ def bp_and(out, *ins):
 
 
 def bp_xor(out, *ins):
-    # 4-valued:
-    #    0 1 - X
-    # 0  0 1 X X
-    # 1  1 0 X X
-    # -  X X X X
-    # X  X X X X
-
-    # 8-valued:           o[0]:            o[1]:            o[2]:
-    #    0 1 - X R F P N  0 1 - X R F P N  0 1 - X R F P N  0 1 - X R F P N
-    # 0  0 1 X X R F P N  0 1 1 1 0 1 0 1  1 0 1 1 0 1 1 0  0 0 0 0 1 1 1 1
-    # 1  1 0 X X F R N P  1 0 1 1 1 0 1 0  0 1 1 1 1 0 0 1  0 0 0 0 1 1 1 1
-    # -  X X X X X X X X  1 1 1 1 1 1 1 1  1 1 1 1 1 1 1 1  0 0 0 0 0 0 0 0
-    # X  X X X X X X X X  1 1 1 1 1 1 1 1  1 1 1 1 1 1 1 1  0 0 0 0 0 0 0 0
-    # R  R F X X P N R F  0 1 1 1 0 1 0 1  0 1 1 1 1 0 0 1  1 1 0 0 1 1 1 1
-    # F  F R X X N P F R  1 0 1 1 1 0 1 0  1 0 1 1 0 1 1 0  1 1 0 0 1 1 1 1
-    # P  P N X X R F P N  0 1 1 1 0 1 0 1  1 0 1 1 0 1 1 0  1 1 0 0 1 1 1 1
-    # N  N P X X F R N P  1 0 1 1 1 0 1 0  0 1 1 1 1 0 0 1  1 1 0 0 1 1 1 1
     md = out.shape[-2]
     for inp in ins: assert md == inp.shape[-2]
     out[...] = 0