<?xml version="1.0" encoding="UTF-8"?>
<sbml xmlns="http://www.sbml.org/sbml/level3/version1/core" level="3" version="1">
  <model substanceUnits="item" timeUnits="second" extentUnits="item">
    <listOfUnitDefinitions>
      <unitDefinition id="per_min">
        <listOfUnits>
          <unit kind="second" exponent="-1" scale="0" multiplier="1"/>
        </listOfUnits>
      </unitDefinition>
    </listOfUnitDefinitions>
    <listOfCompartments>
      <compartment id="c1" spatialDimensions="3" size="1" units="dimensionless" constant="true"/>
    </listOfCompartments>
    <listOfSpecies>
      <species id="B_dot_a1_dot_b2" compartment="c1" initialAmount="200" substanceUnits="item" hasOnlySubstanceUnits="false" boundaryCondition="false" constant="false"/>
      <species id="B_dot_a1_dot_b1" compartment="c1" initialAmount="200" substanceUnits="item" hasOnlySubstanceUnits="false" boundaryCondition="false" constant="false"/>
      <species id="B_dot_a2_dot_b2" compartment="c1" initialAmount="200" substanceUnits="item" hasOnlySubstanceUnits="false" boundaryCondition="false" constant="false"/>
      <species id="B_dot_a2_dot_b1" compartment="c1" initialAmount="200" substanceUnits="item" hasOnlySubstanceUnits="false" boundaryCondition="false" constant="false"/>
    </listOfSpecies>
    <listOfParameters>
      <parameter id="volume" value="1" units="dimensionless" constant="true"/>
      <parameter id="k1" value="1" units="dimensionless" constant="true"/>
    </listOfParameters>
    <listOfReactions>
      <reaction id="reaction_0" reversible="false" fast="false">
        <listOfReactants>
          <speciesReference species="B_dot_a1_dot_b2" stoichiometry="1" constant="true"/>
        </listOfReactants>
        <kineticLaw>
          <math xmlns="http://www.w3.org/1998/Math/MathML">
            <apply>
              <times/>
              <ci> B_dot_a1_dot_b2 </ci>
              <ci> k1 </ci>
            </apply>
          </math>
        </kineticLaw>
      </reaction>
      <reaction id="reaction_1" reversible="false" fast="false">
        <listOfReactants>
          <speciesReference species="B_dot_a1_dot_b1" stoichiometry="1" constant="true"/>
        </listOfReactants>
        <kineticLaw>
          <math xmlns="http://www.w3.org/1998/Math/MathML">
            <apply>
              <times/>
              <ci> B_dot_a1_dot_b1 </ci>
              <ci> k1 </ci>
            </apply>
          </math>
        </kineticLaw>
      </reaction>
      <reaction id="reaction_2" reversible="false" fast="false">
        <listOfReactants>
          <speciesReference species="B_dot_a2_dot_b2" stoichiometry="1" constant="true"/>
        </listOfReactants>
        <kineticLaw>
          <math xmlns="http://www.w3.org/1998/Math/MathML">
            <apply>
              <times/>
              <ci> B_dot_a2_dot_b2 </ci>
              <ci> k1 </ci>
            </apply>
          </math>
        </kineticLaw>
      </reaction>
      <reaction id="reaction_3" reversible="false" fast="false">
        <listOfReactants>
          <speciesReference species="B_dot_a2_dot_b1" stoichiometry="1" constant="true"/>
        </listOfReactants>
        <kineticLaw>
          <math xmlns="http://www.w3.org/1998/Math/MathML">
            <apply>
              <times/>
              <ci> B_dot_a2_dot_b1 </ci>
              <ci> k1 </ci>
            </apply>
          </math>
        </kineticLaw>
      </reaction>
    </listOfReactions>
  </model>
</sbml>