This is Tab 1.

This is Tab 2.

This is Tab 3.

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st=>start: 开始节点
in=>inputoutput: 输入
e=>end: 结束节点
op=>operation: 操作节点
cond=>condition: 条件节点
sub=>subroutine: 子例程
out=>inputoutput: 输出
st(right)->in->op->cond
cond(yes,right)->out->e
cond(no)->sub