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    Equation sum of

    Place an equation phrase in a sum of operation with the symbol EQN_SumSymbol.

    Options can be an object, or an array in the property order below

    To test examples, append them to the boilerplate

    // Simple
    figure.add({
    name: 'eqn',
    make: 'equation',
    forms: {
    1: { sumOf: ['sum', 'x', 'b', 'a'] },
    },
    });
    figure.elements._eqn.showForm('1');
    // Example showing different options
    figure.add({
    name: 'eqn',
    make: 'equation',
    elements: {
    s: { symbol: 'sum', draw: 'dynamic' },
    inf: '\u221e',
    },
    forms: {
    // Object form
    1: {
    sumOf: {
    symbol: 's',
    content: [{ sup: ['x', 'n'] }],
    from: ['n_1', ' ', '=', ' ', '_0'],
    to: '_10',
    },
    },
    // Array form
    2: { sumOf: ['s', [{ sup: ['x', 'm'] }], 'm_1', null]},
    // Styling with options
    3: {
    sumOf: {
    symbol: 's',
    content: { frac: [['x', ' ', '+', ' ', 'm'], 'vinculum', 'a'] },
    from: ['m_1', ' ', '=', ' ', '_0'],
    to: 'inf',
    fromScale: 0.8,
    toScale: 0.8,
    },
    },
    },
    formSeries: ['1', '2', '3'],
    });
    const eqn = figure.elements._eqn;
    eqn.onClick = () => eqn.nextForm();
    eqn.setTouchable();
    eqn.showForm('1');
    @interface