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    <circle
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         style="fill:#000000;stroke-width:0.264583"
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         y="65.279381">$write(\{b\})$:</tspan></text>
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       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
       x="59.340172"
       y="118.94403"
       id="text3707-5-3"><tspan
         sodipodi:role="line"
         id="tspan3705-4-6"
         style="fill:#000000;stroke-width:0.264583"
         x="59.340172"
         y="118.94403">$read()$:</tspan></text>
    <text
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       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#999999;stroke-width:0.264583"
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       y="75.619804"
       id="text3750-7"><tspan
         sodipodi:role="line"
         id="tspan3748-4"
         style="fill:#999999;stroke-width:0.264583"
         x="23.457415"
         y="75.619804">$\not\sqsupseteq \{b\}$</tspan></text>
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       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
       x="23.457415"
       y="84.598038"
       id="text3750-3-4"><tspan
         sodipodi:role="line"
         id="tspan3748-2-3"
         style="fill:#000000;stroke-width:0.264583"
         x="23.457415"
         y="84.598038">$\sqsupseteq \{b\} \to$ OK</tspan></text>
    <text
       xml:space="preserve"
       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#999999;stroke-width:0.264583"
       x="23.457415"
       y="93.54969"
       id="text3750-0-0"><tspan
         sodipodi:role="line"
         id="tspan3748-6-7"
         style="fill:#999999;stroke-width:0.264583"
         x="23.457415"
         y="93.54969">$\not\sqsupseteq \{b\}$</tspan></text>
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       r="2.7302806" />
    <circle
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       cx="67.201363"
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       r="2.7302806" />
    <text
       xml:space="preserve"
       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
       x="72.653946"
       y="127.6125"
       id="text3750-9"><tspan
         sodipodi:role="line"
         id="tspan3748-3"
         style="fill:#000000;stroke-width:0.264583"
         x="72.653946"
         y="127.6125">$\to \{a\}$</tspan></text>
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       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
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       id="text4280-6"><tspan
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         style="fill:#000000;stroke-width:0.264583"
         x="62.764446"
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         id="tspan2630">return $\{a\}$</tspan></text>
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    <text
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       style="font-size:8.46667px;line-height:1.25;font-family:sans-serif;fill:#000000;stroke-width:0.264583"
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       id="text3750-3-6"><tspan
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         id="tspan3748-2-0"
         style="fill:#000000;stroke-width:0.264583"
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