Sandpaper Belt [Tier 1]

A rustic, manually operated sandpaper on a belt; polish shapes by removing one edge.
Outputs a symbol of same color and value as the input but with its shape reduced by one side.
I.e., ⬟ -> ■ -> ▲ -> [void]
Must operate. ▲ are voided.
When powered: you can choose not to operate.

Metadata

{
    "key": "sandpaper_belt",
    "count": 4,
    "tier": 1,
    "machine": "Sandpaper Belt",
    "background": "machine-1.png",
    "description": "_A rustic, manually operated sandpaper on a belt; polish shapes by removing one edge._\nOutputs a symbol of same color and value as the input but with its shape reduced by one side.\nI.e., [pentagon] -> [square] -> [triangle] -> [void]\nMust operate. [triangle] are voided.\n[power]: you can choose not to operate.\n",
    "bands": {
        "rightTop": "itemInput",
        "leftTop": "itemOutput"
    }
}