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    Product equation symbol used with the EQN_ProdOf equation function.

                                             width
                   |<--------------------------------------------------------->|
                   |                                                           |
                   |                                                           |
                   |                                                           |
                   |                          lineWidth                        |
                   |                            /                              |
                   |                           /                               |
             ---- 00000000000000000000000000000000000000000000000000000000000000
             A         000000000000000000000000000000000000000000000000000000
             |           00000000000000000000000000000000000000000000000000
             |            00000000000                         00000000000
             |            00000000000                         00000000000
             |            00000000000                         00000000000
             |            00000000000                         00000000000
             |            00000000000                         00000000000
             |            00000000000                         00000000000
             |            00000000000                         00000000000
             |            00000000000                         00000000000
             |            00000000000                         00000000000
     height  |            00000000000                         00000000000
             |            00000000000                         00000000000
             |            00000000000                         00000000000
             |            00000000000                         00000000000
             |            00000000000                         00000000000
             |            00000000000                         00000000000
             |            00000000000                         00000000000
             |            00000000000                         00000000000
             |            00000000000                         00000000000
             |            00000000000                         00000000000
             |            00000000000                         00000000000
             |           0000000000000                       00000000000000
             V         00000000000000000                   000000000000000000
             ----- 0000000000000000000000000           00000000000000000000000000
    
    // Define in element
    figure.add({
    make: 'equation',
    elements: {
    sigma: { symbol: 'prod' },
    },
    forms: {
    form1: { prodOf: ['sigma', 'a', 'a = 0', 'n'] },
    },
    });
    // Define inline simple one use
    figure.add({
    make: 'equation',
    forms: {
    form1: { prodOf: ['prod', 'a', 'a = 0', 'n'] },
    },
    });
    // Define inline with reuse
    const eqn = figure.add({
    make: 'equation',
    forms: {
    form1: { prodOf: ['p1_prod', 'a', 'a = 0', 'n'] },
    form2: { prodOf: ['p1', 'a', 'a = 0', 'm'] },
    },
    });
    eqn.animations.new()
    .goToForm({ delay: 1, target: 'form2', animate: 'move' })
    .start();
    // Define inline with customization
    figure.add({
    make: 'equation',
    forms: {
    form1: { prodOf: [{ prod: { lineWidth: 0.01 } }, 'a', 'a = 0', 'n'] },
    },
    });
    @interface