Question: how many dominoes do you need for mexican train
[{'answer': 'A double - twelve set', 'provenance': [{'wikipedia_id': '7727938', 'title': 'Mexican Train', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 22, 'bleu_score': 1.0, 'section': 'Section::::Equipment.\n'}]}, {'provenance': [{'wikipedia_id': '7727938', 'title': 'Mexican Train', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 233, 'bleu_score': 0.950578622812921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1182880578833575248}, 'section': 'Section::::Equipment.\n'}]}, {'provenance': [{'wikipedia_id': '7727938', 'title': 'Mexican Train', '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': 1182880578833575248}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '7594962', 'title': 'Chicken foot (game)', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['Chicken foot, also known as Chicken dominoes, Chickie dominoes, and Chickie, is a dominoes game of the "Trains" family, similar to Mexican Train. Chicken Foot is played in rounds, one round for each double domino in the set. The game is normally played by 2 to 8 players using any of the common sets (double-six, double-nine, double-twelve, double-fifteen or double-eighteen). If a player does not tap their last domino on the table when they are down to one and the next player plays a domino they must draw from the bone yard.', 'The game is normally played by 2 to 8 players using any of the common sets (double-six, double-nine, double-twelve,', 'Chicken foot, also known as Chicken dominoes, Chickie dominoes, and Chickie, is a dominoes game of the "Trains" family, similar to Mexican Train. Chicken Foot is played in rounds, one round for each double domino in the set. The game is normally played by 2 to 8 players using any of the common sets (double-six, double-nine, double-twelve, double-fifteen or double-eighteen). If a player does not tap their last domino on the table when they are down to one and the next player plays a domino they must draw from the bone yard.']}}]}, {'provenance': [{'wikipedia_id': '7727938', 'title': 'Mexican Train', 'section': 'Section::::Variations.\n', 'start_paragraph_id': 52, 'end_paragraph_id': 52, 'meta': {'evidence_span': ['first turn" string of dominoes for when they have a chance, instead of being stuck with all dominoes from the beginning. Branching Doubles variation: Once a double has been satisfied, players may continue to branch off of the double in two more directions, meaning the double will have a matching endpoint on all four sides. Often, players like to angle these branches at a 45-degree angle to accommodate for more room. This variant gives players more choice and speeds up the game. Swan Drive variation: A player who can', 'first turn" string of dominoes for when they have a chance, instead of being stuck with all dominoes from the beginning. Branching Doubles variation: Once a double has been satisfied, players may continue to branch off of the double in two more directions, meaning the double will have a matching endpoint on all four sides. Often, players like to angle these branches at a 45-degree angle to accommodate for more room. This variant gives players more choice and speeds up the game. Swan Drive variation: A player who can']}}]}, {'provenance': [{'wikipedia_id': '7727938', 'title': 'Mexican Train', 'section': 'Section::::Equipment.\n', 'start_paragraph_id': 3, 'end_paragraph_id': 3, 'meta': {'evidence_span': ['A double-twelve set of dominoes is marketed as the standard for Mexican Train, and accommodates up to 8 players. Other sets are commonly used as well. The following alternate sets are common, depending on the number of people playing:', 'A double-twelve set of dominoes is marketed as the standard for Mexican Train, and accommodates up to 8 players.']}}]}]