9/20)a+(3/10)b" "(1/20)a+(1/5)b"</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 4 "(1/15)b"        "(1/5)a+(4/15)b"  "(3/5)a+(4/15)b"  "(1/5)a+(2/5)b" </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 5 "0"              "(1/6)b"          "(1/2)a+(1/6)b"   "(1/2)a+(2/3)b" </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 6 "0"              "0"               "0"               "a+b"           </span>
<span class="r-in"><span><span class="fu">gsegmat_symb</span><span cla