<h4>&nbsp;</h4>
<ul>
<li>INCOME->SAVING: receive salary, sell products, get bonuses, etc.</li>
<li>INCOME->EXPENSE: Payment some fee by employer</li>
<li>INCOME->INCOME: Rarely used.</li>
<li>INCOME->DEBT: Other people receive wages, collect rents, and collect payments, etc.</li>

<li>DEBT->SAVING: Borrow someone else's money,Recover arrears.</li>
<li>DEBT->EXPENSE: Payment by friends, credit card consumption, loan consumption, etc.</li>
<li>DEBT->INCOME: Rarely used.</li>
<li>DEBT->DEBT: For example, A owes me money, and I owe B money. A pays B directly, which means that I withdraw A's money and pay B.</li>

<li>SAVING->EXCHANGE: Pay a currency for exchange.</li>
<li>EXCHANGE->SAVING: Received the exchanged currency.</li>
</ul>