{
  "task": {
    "id": "case_19",
    "name": "sequential_duplicate_removal",
    "summary": "Removes consecutive duplicate tokens from a sequence.",
    "examples": [
      {
        "input": [
          "BOS",
          "c",
          "a",
          "c",
          "c",
          "a",
          "a",
          "c",
          "b",
          "c",
          "c",
          "c",
          "c",
          "a",
          "c"
        ],
        "output": [
          "BOS",
          null,
          "a",
          "c",
          null,
          "a",
          null,
          "c",
          "b",
          "c",
          null,
          null,
          null,
          "a",
          "c"
        ]
      },
      {
        "input": [
          "BOS",
          "c",
          "c",
          "b",
          "c",
          "b",
          "b",
          "c",
          "b",
          "c",
          "c",
          "a",
          "c",
          "a",
          "c"
        ],
        "output": [
          "BOS",
          null,
          null,
          "b",
          "c",
          "b",
          null,
          "c",
          "b",
          "c",
          null,
          "a",
          "c",
          "a",
          "c"
        ]
      },
      {
        "input": [
          "BOS",
          "c",
          "a",
          "a",
          "c",
          "b",
          "a",
          "b",
          "b",
          "b",
          "a",
          "b",
          "a",
          "b",
          "c"
        ],
        "output": [
          "BOS",
          null,
          "a",
          null,
          "c",
          "b",
          "a",
          "b",
          null,
          null,
          "a",
          "b",
          "a",
          "b",
          "c"
        ]
      },
      {
        "input": [
          "BOS",
          "c",
          "a",
          "c",
          "c",
          "b",
          "a",
          "b",
          "b",
          "b",
          "b",
          "b",
          "b",
          "b",
          "a"
        ],
        "output": [
          "BOS",
          null,
          "a",
          "c",
          null,
          "b",
          "a",
          "b",
          null,
          null,
          null,
          null,
          null,
          null,
          "a"
        ]
      },
      {
        "input": [
          "BOS",
          "b",
          "a",
          "b",
          "b",
          "b",
          "b",
          "a",
          "a",
          "b",
          "b",
          "a",
          "a",
          "a",
          "c"
        ],
        "output": [
          "BOS",
          null,
          "a",
          "b",
          null,
          null,
          null,
          "a",
          null,
          "b",
          null,
          "a",
          null,
          null,
          "c"
        ]
      }
    ],
    "is_categorical": true
  },
  "program": "shifted_sop = shift_by(1, sop)\nduplicate_removal_sop = rasp.SequenceMap(lambda x, y: x if x != y else None, sop, shifted_sop).named(\"sequential_duplicate_removal\")\nreturn duplicate_removal_sop",
  "components": [
    {
      "id": "L0H0_ATTN",
      "hook": "blocks.0.attn.hook_result[0]",
      "role": {
        "tag": "ROUTER",
        "note": "Shifts the sequence by one position to expose the previous token at each index for comparison."
      },
      "rasp_vars": [
        "shifted_sop"
      ],
      "labels": [
        "shift_by(1)_2"
      ]
    },
    {
      "id": "L0_MLP",
      "hook": "blocks.0.mlp.hook_post",
      "role": {
        "tag": "COMBINER",
        "note": "Compares each token to the previous token and outputs the token only when it differs; otherwise outputs None to remove consecutive duplicates."
      },
      "rasp_vars": [
        "sequential_duplicate_removal"
      ],
      "labels": [
        "sequential_duplicate_removal_1"
      ]
    }
  ]
}