{
  "name": "d2",
  "word": "_identifier",
  "rules": {
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        "type": "SYMBOL",
        "name": "_root_definition"
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    },
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      "type": "CHOICE",
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        {
          "type": "SYMBOL",
          "name": "_eol"
        },
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            {
              "type": "CHOICE",
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                {
                  "type": "ALIAS",
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                    "type": "SYMBOL",
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                  "named": true,
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                },
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                  "type": "SYMBOL",
                  "name": "shape"
                },
                {
                  "type": "SYMBOL",
                  "name": "container"
                },
                {
                  "type": "SYMBOL",
                  "name": "connection"
                }
              ]
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              "type": "SYMBOL",
              "name": "_end"
            }
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        }
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          "type": "SYMBOL",
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        {
          "type": "REPEAT1",
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            "type": "SEQ",
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              {
                "type": "SYMBOL",
                "name": "arrow"
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                "type": "SYMBOL",
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            ]
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          "type": "CHOICE",
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            {
              "type": "SEQ",
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                  "type": "SYMBOL",
                  "name": "label"
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              "type": "BLANK"
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                  "type": "ALIAS",
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          "name": "shape_key"
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                            "type": "SEQ",
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                                "type": "ALIAS",
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                                "named": true,
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                            "type": "BLANK"
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          "type": "REPEAT",
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        {
          "type": "STRING",
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                {
                  "type": "SYMBOL",
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                {
                  "type": "SYMBOL",
                  "name": "connection"
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                {
                  "type": "SYMBOL",
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              "type": "SYMBOL",
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                  {
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                "type": "BLANK"
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        {
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            {
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            },
            {
              "type": "CHOICE",
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                {
                  "type": "SYMBOL",
                  "name": "_dash"
                },
                {
                  "type": "BLANK"
                }
              ]
            }
          ]
        }
      ]
    },
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      "type": "TOKEN",
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        "type": "PREC",
        "value": 0,
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          "type": "PATTERN",
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        }
      }
    },
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        {
          "type": "ALIAS",
          "content": {
            "type": "SYMBOL",
            "name": "_root_attr_key"
          },
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          "value": "attr_key"
        },
        {
          "type": "SYMBOL",
          "name": "_colon"
        },
        {
          "type": "SYMBOL",
          "name": "attr_value"
        }
      ]
    },
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        {
          "type": "STRING",
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        },
        {
          "type": "ALIAS",
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                "type": "STRING",
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              },
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                "value": "label"
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                "type": "STRING",
                "value": "constraint"
              },
              {
                "type": "STRING",
                "value": "icon"
              },
              {
                "type": "STRING",
                "value": "style"
              },
              {
                "type": "SYMBOL",
                "name": "_common_style_attr_key"
              },
              {
                "type": "SYMBOL",
                "name": "_text_attr_key"
              }
            ]
          },
          "named": true,
          "value": "reserved"
        }
      ]
    },
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        {
          "type": "ALIAS",
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            "name": "_base_shape_attribute"
          },
          "named": true,
          "value": "attribute"
        },
        {
          "type": "ALIAS",
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            "type": "SYMBOL",
            "name": "_style_attribute"
          },
          "named": true,
          "value": "attribute"
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      ]
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          "type": "ALIAS",
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            "type": "SYMBOL",
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          "named": true,
          "value": "attr_key"
        },
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          "type": "SYMBOL",
          "name": "attr_value"
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      ]
    },
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          },
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                "type": "SEQ",
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          "type": "STRING",
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      ]
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      ]
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}