Question: how many strong verbs are there in german
[{'answer': 'more than 200', 'provenance': [{'wikipedia_id': '4382287', 'title': 'German verbs', 'start_paragraph_id': 1, 'start_character': 413, 'end_paragraph_id': 1, 'end_character': 426, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'more than 200 strong', 'provenance': [{'wikipedia_id': '4382287', 'title': 'German verbs', 'start_paragraph_id': 1, 'start_character': 413, 'end_paragraph_id': 1, 'end_character': 433, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4382287', 'title': 'German verbs', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 518, 'bleu_score': 0.9097823561564, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14149465162750780139}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4382287', 'title': 'German verbs', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14149465162750780139}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4382287', 'title': 'German verbs', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['more than 200 strong', 'There are more than 200 strong and irregular verbs, but there is a gradual tendency for strong verbs to become weak.', 'German verbs may be classified as either "weak", with a dental consonant inflection, or "strong", showing a vowel gradation (ablaut). Both of these are regular systems. Most verbs of both types are regular, though various subgroups and anomalies do arise; however, textbooks for learners often class all strong verbs as irregular. The only completely irregular verb in the language is "sein" ("to be"). There are more than 200 strong and irregular verbs, but there is a gradual tendency for strong verbs to become weak.']}}]}]