当数组的数量和每个数组的长度未知时，生成字符组合的所有排列

I'm not sure how to ask my question in a succinct way, so I'll start with examples and expand from there. I am working with VBA, but I think this problem is non language specific and would only require a bright mind that can provide a pseudo code framework. Thanks in advance for the help!I'm not sure how to ask my question in a succin