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- name: layout
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  schema:
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    anyOf:
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      - string
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      - arrayOf:
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          arrayOf: number
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  description:
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    short: "2d-array of widths where the first dimension specifies columns and the second rows."
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    long: |
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      2d-array of widths where the first dimension specifies columns and the second rows.
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      For example, to layout the first two output blocks side-by-side on the top with the third
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      block spanning the full width below, use `[[3,3], [1]]`.
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      Use negative values to create margin. For example, to create space between the 
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      output blocks in the top row of the previous example, use `[[3,-1, 3], [1]]`.
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- name: layout-ncol
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  schema: number
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  description: Layout output blocks into columns
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- name: layout-nrow
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  schema: number
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  description: Layout output blocks into rows
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- name: layout-align
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  schema:
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    enum: [default, left, center, right]
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  default: center
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  description: Horizontal alignment for layout content (`default`, `left`, `right`, or `center`)
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- name: layout-valign
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  schema:
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    enum: [default, top, center, bottom]
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  default: top
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  description: Vertical alignment for layout content (`default`, `top`, `center`, or `bottom`)
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