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Here's a useful function to add to your helpers.js file.

function empty(card) {
var src=card.src; var ok=true;
if (src.indexOf('empty')==-1) ok=false;
return ok;
}

We can now turn our attention to incorporating the temp panel into check_first(card).

function check_first(card) {
var ok; g_seq=[];
if (empty(card)) {
ok=false;
} else {
if (klass(card)=='temp') {
ok=true;
} else { // must be main
var c=card.style.gridColumnStart; // column #
...
}
}
return ok;
}

If you try to move a card from main to temp, once again nothing happens.
This time it's check_second(card) that is falling over.

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