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<b>consider </b><font color="Maroon">c<sub>1</sub></font> being  <a href="setfam_1.html#V1">with_non-empty_elements</a>  <a href="hidden.html#M1">set</a> , <font color="Maroon">c<sub>2</sub></font> being   <a href="funct_2.html#NM1">Function</a> of 0,<font color="Maroon">c<sub>1</sub></font>;<br/>
<b>take </b>
 <a href="card_3.html#K4">product</a> <font color="Maroon">c<sub>2</sub></font>
;<br/>

<b>thus </b><a NAME="E2:9_1_1"/>
(  <a href="card_3.html#K4">product</a> <font color="Maroon">c<sub>2</sub></font> is <a href="amistd_2.html#V1" target="_self">product-like</a> &amp; not  <a href="card_3.html#K4">product</a> <font color="Maroon">c<sub>2</sub></font> is <a href="xboole_0.html#V1">empty</a> )
 ;<br/>


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