Question: how many different kinds of pokemon cards are there
[{'answer': 'eleven', 'provenance': [{'wikipedia_id': '431322', 'title': 'Pokémon Trading Card Game', 'start_paragraph_id': 13, 'start_character': 129, 'end_paragraph_id': 13, 'end_character': 135, 'bleu_score': 1.0, 'section': 'Section::::Gameplay.:Pokémon types.\n'}]}, {'provenance': [{'wikipedia_id': '431322', 'title': 'Pokémon Trading Card Game', 'start_paragraph_id': 13, 'start_character': 0, 'end_paragraph_id': 13, 'end_character': 532, 'bleu_score': 0.8913113961248771, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11609907032990256583}, 'section': 'Section::::Gameplay.:Pokémon types.\n'}]}, {'provenance': [{'wikipedia_id': '431322', 'title': 'Pokémon Trading Card Game', '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': 11609907032990256583}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '431322', 'title': 'Pokémon Trading Card Game', 'section': 'Section::::Gameplay.:Pokémon types.\n', 'start_paragraph_id': 13, 'end_paragraph_id': 13, 'meta': {'evidence_span': ['A simplified type system was adopted from the video games for use in the trading card game. Instead of 18 types of Pokémon, only eleven exist in the TCG. Seven were introduced first set of Pokémon cards, the Base Set; Darkness and Metal types appeared when "Pokémon Gold" and "Silver" introduced the Dark and Steel types in the video games; the Dragon type was introduced in the Japanese "Dragon Selection" set; and finally, the Fairy type was introduced in the Japanese "XY" set to correspond to its introduction in the video games.', 'Instead of 18 types of Pokémon, only eleven exist in the TCG.', 'A simplified type system was adopted from the video games for use in the trading card game. Instead of 18 types of Pokémon, only eleven exist in the TCG. Seven were introduced first set of Pokémon cards, the Base Set; Darkness and Metal types appeared when "Pokémon Gold" and "Silver" introduced the Dark and Steel types in the video games; the Dragon type was introduced in the Japanese "Dragon Selection" set; and finally, the Fairy type was introduced in the Japanese "XY" set to correspond to its introduction in the video games.']}}]}]