      "Seidenen": "Seidene",
      "Seidenmatten": "Seidenmatte",
      "Seifen": "Seife",
      "Seifenden": "Seifende",
      "Seifenopern": "Seifenoper",
      "Seifens": "Seifen",
 
</s>
    "Seid": "sein",
    "Seiend": "sein",
    "Seien": "sein",
    "Seiest": "sein",
    "Seiet": "sein",
      "Seidenen": "Seidene",
      "Seidenmatten": "Seidenmatte",
    "Seid": "sein",
    "Seiend": "sein",
    "Seien": "sein",
    "Seiest": "sein",
    "Seiet": "sein",
      "Seifen": "Seife",
      "Seifenden": "Seifende",
      "Seifenopern": "Seifenoper",
      "Seifens": "Seifen",
keep add keep keep keep keep
 German lemmatizer additions (#2529)

* lemma of was-> was

* added new pairs issue @2486

* added article tests
spacy/lang/de/lemmatizer.py