fixing duplicates

main.bib

@@ -3265,17 +3265,6 @@
   keywords     = {morphology},
 }
 
-@InProceedings{Kinkade1998,
-  author    = {Kinkade, M. Dale},
-  booktitle = {Proceedings of the 33rd International Conference on Salish and Neighboring Languages},
-  title     = {Origins of lexical suffixes},
-  pages     = {266--295},
-  date      = {1998},
-  file      = {Documents/reading/morphology/kinkade1998origins.pdf},
-  keywords  = {morphology},
-  location  = {Seattle, Washington},
-}
-
 @InBook{Kiparsky2005,
   author    = {Kiparsky, Paul},
   editor    = {Booij, Geert and {van Marle}, Jaap},
@@ -7625,13 +7614,13 @@
   keywords  = {semantics},
 }
 
-@InProceedings{Luo2012,
+@InProceedings{Luo2012b,
   author    = {Luo, Zhaohui},
   booktitle = {International Conference on Logical Aspects of Computational Linguistics},
+  date      = {2012},
   title     = {Common nouns as types},
   editor    = {Béchet, Denis and Dikovsky, Alexander},
   publisher = {Springer},
-  date      = {2012},
   keywords  = {semantics},
 }
 
@@ -8842,12 +8831,12 @@
   keywords  = {syntax},
 }
 
-@InProceedings{Pollard2015,
+@InProceedings{Pollard2015a,
   author    = {Pollard, Carl and Worth, Chris},
   booktitle = {Proceedings for the ESSLLI 2015 Workshop on Empirical Advances in Categorial Grammar (CG 2015)},
+  date      = {2015},
   title     = {Coordination in Linear Categorial Grammar with Phenogrammatical Subtyping},
   pages     = {162--182},
-  date      = {2015},
   keywords  = {syntax},
 }