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    <p class="MsoNormal"
      style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:
      normal"><span style="font-size:12.0pt;font-family:"Times New
        Roman","serif";
        mso-fareast-font-family:"Times New
        Roman";mso-ansi-language:EN-US;mso-fareast-language:
        DE" lang="EN-US">Yoho,<br>
        we have .problem's with only one variation, so they are static.
        I want build a
        .problem that switch between this already existing static
        problem's. So that
        randomly chooses out of these .problem’s. <o:p></o:p></span></p>
    <p class="MsoNormal"
      style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:
      normal"><span style="font-size:12.0pt;font-family:"Times New
        Roman","serif";
        mso-fareast-font-family:"Times New
        Roman";mso-ansi-language:EN-US;mso-fareast-language:
        DE" lang="EN-US"><o:p> </o:p></span></p>
    <p class="MsoNormal"
      style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:
      normal"><span style="font-size:12.0pt;font-family:"Times New
        Roman","serif";
        mso-fareast-font-family:"Times New
        Roman";mso-fareast-language:DE">Example:<o:p></o:p></span></p>
    <p class="MsoNormal"
      style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:
      normal"><span style="font-size:12.0pt;font-family:"Times New
        Roman","serif";
        mso-fareast-font-family:"Times New
        Roman";mso-ansi-language:EN-US;mso-fareast-language:
        DE" lang="EN-US">Problem-1 use function 2^x<o:p></o:p></span></p>
    <p class="MsoNormal"
      style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:
      normal"><span style="font-size:12.0pt;font-family:"Times New
        Roman","serif";
        mso-fareast-font-family:"Times New
        Roman";mso-ansi-language:EN-US;mso-fareast-language:
        DE" lang="EN-US">Problem-2 use function 2^2*x<o:p></o:p></span></p>
    <p class="MsoNormal"
      style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:
      normal"><span style="font-size:12.0pt;font-family:"Times New
        Roman","serif";
        mso-fareast-font-family:"Times New
        Roman";mso-ansi-language:EN-US;mso-fareast-language:
        DE" lang="EN-US">Problem-3 use function 2*2^x<o:p></o:p></span></p>
    <p class="MsoNormal"
      style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:
      normal"><span style="font-size:12.0pt;font-family:"Times New
        Roman","serif";
        mso-fareast-font-family:"Times New
        Roman";mso-ansi-language:EN-US;mso-fareast-language:
        DE" lang="EN-US"><o:p> </o:p></span></p>
    <p class="MsoNormal"
      style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:
      normal"><span style="font-size:12.0pt;font-family:"Times New
        Roman","serif";
        mso-fareast-font-family:"Times New
        Roman";mso-ansi-language:EN-US;mso-fareast-language:
        DE" lang="EN-US">Problem in Problem: Switch between Problem-1,
        Problem-2 and Problem-3.<o:p></o:p></span></p>
    <p class="MsoNormal"
      style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:
      normal"><span style="font-size:12.0pt;font-family:"Times New
        Roman","serif";
        mso-fareast-font-family:"Times New
        Roman";mso-ansi-language:EN-US;mso-fareast-language:
        DE" lang="EN-US"><br>
        Cone</span></p>
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