<h4>&nbsp;</h4>
<ul>
<li>INCOME->SAVING: 收入操作，领工资、出售产品、获得奖金、劳务所得等。</li>
<li>INCOME->EXPENSE: 退回多收的款项，或者公司代扣代缴等费用。</li>
<li>INCOME->INCOME: 很少用。</li>
<li>INCOME->DEBT: 朋友代领工资、代收租金、代收货款。</li>

<li>DEBT->SAVING: 借别人款、收回欠款。</li>
<li>DEBT->EXPENSE: 朋友代付款消费、信用卡消费、贷款消费等。</li>
<li>DEBT->INCOME: 很少用，朋友代退款。</li>
<li>DEBT->DEBT: 比如A欠我钱，我又欠B钱，由A直接付给B，等于我收回A的钱然后付B。</li>

<li>SAVING->EXCHANGE: 付出一种货币用于兑换。</li>
<li>EXCHANGE->SAVING: 接收到兑换过的货币。</li>
</ul>