{
    "name": "Shift Work Problem",
    "background": " http://www.algebra.com/algebra/homework/coordinate/word/THEO-2012-01-26.lesson",
    "optimize": "ppl",
    "opType": "min",
    "constraints": {
        "d0": {
            "min": 4
        },
        "d4": {
            "min": 8
        },
        "d8": {
            "min": 10
        },
        "d12": {
            "min": 7
        },
        "d16": {
            "min": 12
        },
        "d20": {
            "min": 4
        }
    },
    "variables": {
        "shft_0": {
            "d0": 1,
            "d4": 1,
            "ppl": 1
        },
        "shft_4": {
            "d4": 1,
            "d8": 1,
            "ppl": 1
        },
        "shft_8": {
            "d8": 1,
            "d12": 1,
            "ppl": 1
        },
        "shft_12": {
            "d12": 1,
            "d16": 1,
            "ppl": 1
        },
        "shft_16": {
            "d16": 1,
            "d20": 1,
            "ppl": 1
        },
        "shft_20": {
            "d20": 1,
            "d0": 1,
            "ppl": 1
        }
    },
    "expects": {
        "feasible": true,
        "shft_0": 4,
        "shft_4": 10,
        "shft_12": 8,
        "shft_16": 4,
        "result": 26
    }
}