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[
{
"answer": true,
"tree": [
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],
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]
]
},
{
"answer": false,
"tree": [
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1,
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2,
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],
null
]
},
{
"answer": false,
"tree": [
2,
1,
[
1,
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null,
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],
[
4,
1,
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3,
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null,
null
],
null
]
]
},
{
"answer": false,
"tree": [
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[
1,
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null,
null
],
[
4,
2,
[
3,
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null,
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],
[
5,
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]
]
]
]
}
]