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    "tet",
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    "tia",
    "tif",
    "trf",
    "tsc",
    "wle"
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      "title": "Estimate and plot IRT models for binary responses",
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        "irtoys"
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      "title": "Estimate ability",
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      "title": "The api appropriateness index",
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      "title": "EAP estimation of ability",
      "topics": [
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    {
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      "title": "Plot empirical response function",
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