Cannot read properties of undefined (reading 'shoebox')

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[16, 6, 1, 6]
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[]
[]
[]
[]
[]
[]
[]
[10, 6]
[10, 10]
[10, 20]
[10, 30]
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[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]
[]