function _formatSequenceAsHtml(sequence) {
        var combos = [],
            i;

        for (i = 0; i < sequence.length; ++i) {
            combos.push('<span>' + _formatKeysAsHtml(sequence[i].split('+')) + '</span>');
        }

        return combos.join(' ');
    }
Peanut butter goes great with jelly.

@author Dan Tao <daniel.tao@gmail.com>