{
  "type": "project",
  "input": {
    "type": "leftjoin",
    "input": [
      {
        "type": "leftjoin",
        "input": [
          {
            "type": "leftjoin",
            "input": [
              {
                "type": "leftjoin",
                "input": [
                  {
                    "type": "leftjoin",
                    "input": [
                      {
                        "type": "leftjoin",
                        "input": [
                          {
                            "type": "bgp",
                            "patterns": []
                          },
                          {
                            "type": "bgp",
                            "patterns": [
                              {
                                "type": "pattern",
                                "termType": "Quad",
                                "subject": {
                                  "termType": "NamedNode",
                                  "value": "http://example.com/xxx/abc"
                                },
                                "predicate": {
                                  "termType": "NamedNode",
                                  "value": "http://example.org/ns#p"
                                },
                                "object": {
                                  "termType": "Variable",
                                  "value": "res0"
                                },
                                "graph": {
                                  "termType": "DefaultGraph",
                                  "value": ""
                                }
                              }
                            ]
                          }
                        ]
                      },
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                        "type": "bgp",
                        "patterns": [
                          {
                            "type": "pattern",
                            "termType": "Quad",
                            "subject": {
                              "termType": "NamedNode",
                              "value": "http://example.com/xxx/def"
                            },
                            "predicate": {
                              "termType": "NamedNode",
                              "value": "http://example.org/ns#p"
                            },
                            "object": {
                              "termType": "Variable",
                              "value": "res1"
                            },
                            "graph": {
                              "termType": "DefaultGraph",
                              "value": ""
                            }
                          }
                        ]
                      }
                    ]
                  },
                  {
                    "type": "bgp",
                    "patterns": [
                      {
                        "type": "pattern",
                        "termType": "Quad",
                        "subject": {
                          "termType": "NamedNode",
                          "value": "http://example.com/xxx/abc#ghi"
                        },
                        "predicate": {
                          "termType": "NamedNode",
                          "value": "http://example.org/ns#p"
                        },
                        "object": {
                          "termType": "Variable",
                          "value": "res2"
                        },
                        "graph": {
                          "termType": "DefaultGraph",
                          "value": ""
                        }
                      }
                    ]
                  }
                ]
              },
              {
                "type": "bgp",
                "patterns": [
                  {
                    "type": "pattern",
                    "termType": "Quad",
                    "subject": {
                      "termType": "NamedNode",
                      "value": "http://example.com/xxx/jkl"
                    },
                    "predicate": {
                      "termType": "NamedNode",
                      "value": "http://example.org/ns#p"
                    },
                    "object": {
                      "termType": "Variable",
                      "value": "res3"
                    },
                    "graph": {
                      "termType": "DefaultGraph",
                      "value": ""
                    }
                  }
                ]
              }
            ]
          },
          {
            "type": "bgp",
            "patterns": [
              {
                "type": "pattern",
                "termType": "Quad",
                "subject": {
                  "termType": "NamedNode",
                  "value": "http://example.com/mno"
                },
                "predicate": {
                  "termType": "NamedNode",
                  "value": "http://example.org/ns#p"
                },
                "object": {
                  "termType": "Variable",
                  "value": "res4"
                },
                "graph": {
                  "termType": "DefaultGraph",
                  "value": ""
                }
              }
            ]
          }
        ]
      },
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        "type": "bgp",
        "patterns": [
          {
            "type": "pattern",
            "termType": "Quad",
            "subject": {
              "termType": "NamedNode",
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            },
            "predicate": {
              "termType": "NamedNode",
              "value": "http://example.org/ns#p"
            },
            "object": {
              "termType": "Variable",
              "value": "res5"
            },
            "graph": {
              "termType": "DefaultGraph",
              "value": ""
            }
          }
        ]
      }
    ]
  },
  "variables": [
    {
      "termType": "Variable",
      "value": "res0"
    },
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      "termType": "Variable",
      "value": "res1"
    },
    {
      "termType": "Variable",
      "value": "res2"
    },
    {
      "termType": "Variable",
      "value": "res3"
    },
    {
      "termType": "Variable",
      "value": "res4"
    },
    {
      "termType": "Variable",
      "value": "res5"
    }
  ]
}