Input deck names and it will spit out the 0-20 card names
<br/>
<br/>
<textarea id="textbox" style="width:400px"></textarea>
<button onclick="addNumbers()">Click</button>
<br/>
<br/>
<textarea id="output">Output here</textarea>
<script>
    function addNumbers() {
        var decknames = document.getElementById('textbox').value;
        decknames = decknames.replace(/\s+/g, '');
        console.log(decknames);
        var deckarray = decknames.split(',');
        console.log(deckarray);
        
        var outputArray = [];
        
        var suffix = ['01', '02', '03', '04', '05', '06', '07', '08','09', '10','11', '12','13', '14', '15', '16', '17', '18', '19', '20'];
        
        for (let i = 0; i < deckarray.length; i++) {
            
            var deckarray2 = suffix.map(v => deckarray[i] + v);
            console.log(deckarray2);
            outputArray.push(deckarray2);
            console.log(outputArray);
        }

        document.getElementById('output').innerText = outputArray;
        
    }
</script>