+1*I5T1+1*I6T1</span></span>
<span><span class="st">     F2=~ 1*I3T2 +1*I4T2+1*I5T2+1*I6T2+1*I7T2+1*I8T2</span></span>
<span><span class="st">     F1 ~~ F1</span></span>
<span><span class="st">     F1 ~~ F2</span></span>
<span><span class="st">     F2 ~~ F2</span></span>
<span><span class="st">     # equal item difficulties of same items</span></span>
<span><span class="st">     I3T1 | i3*t1</span></span>
<span><span class="st">     I3T2 | i3*t1</span></span>
<span><span class="st">     I4T1 | i4*t1</span><