data.json

{
    "activities": [
        {
            "clas": "mat",
            "day": "Monday",
            "group": "1a",
            "room": "110",
            "slot": 1,
            "teacher": "kowalski"
        },
        {
            "clas": "eng",
            "day": "Friday",
            "group": "1c",
            "room": "121",
            "slot": 3,
            "teacher": "nowak"
        },
        {
            "clas": "biol",
            "day": "Friday",
            "group": "2b",
            "room": "110",
            "slot": 4,
            "teacher": "may"
        },
        {
            "clas": "phys",
            "day": "Wednesday",
            "group": "4b",
            "room": "120",
            "slot": 0,
            "teacher": "hammond"
        },
        {
            "clas": "phys",
            "day": "Wednesday",
            "group": "3a",
            "room": "111",
            "slot": 4,
            "teacher": "atkinson"
        }
    ],
    "classes": [
        "mat",
        "geo",
        "eng",
        "phys",
        "biol"
    ],
    "groups": [
        "1a",
        "1b",
        "1c",
        "2a",
        "2b",
        "3a",
        "3b",
        "4a",
        "4b"
    ],
    "rooms": [
        "110",
        "111",
        "120",
        "121"
    ],
    "teachers": [
        "kowalski",
        "nowak",
        "smith",
        "clarkson",
        "may",
        "hammond",
        "atkinson"
    ]
}