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    <title>JavaScriptmas | Challenge 22</title>
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        <h1>22. Extract Matrix Column</h1>
        <br>
        <p>
            Create a matrix (an array of integer arrays where each integer array represents a row).
            <br><br>
            From that matrix, choose a column from which to extract numbers to create a new array (the left-most number in an array is in column 0).
        </p>
        <br>
        <h3>Matrix: [<span id="matrix"></span>]</h3>
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        <form>
            <label for="arr">Add an integer array to the matrix: </label>
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            <input id="arr" type="string" placeholder="e.g. 1,2,61,23,43,0">
            <button id="submit-arr" type="submit">Add</button>
        </form>
        <p class="note">*Note: Separate integers by a comma (no space)</p>
        <br>
        <button id="remove-last" class="backspace input-width-btn" type="submit">Remove Last Array</button>
        <button id="clear-all" class="clear input-width-btn"type="submit">Clear Matrix</button>
        <br><br>
        <form>
            <label for="col">Extract column: </label>
            <br>
            <input id="col" type="number" placeholder="e.g. 2">
            <button id="submit" class="input-width-btn result-btn" type="submit">Extract Columns</button>
        </form>
        <br><br>
        <h3>Extracted integers from matrix columns: [<span id="extracted-arr"></span>]</h3>
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