A typical  entry in one of the tables below has the following form:
<dd> [[1 1 2 1 1][0 0 1 1 2]]
<dd> This records a pdc of length 2 whose first element has rank 1
and must lie between 1/2 and 1/1 and whose second element has rank 0
and must lie between 0/1 and 1/2.  



<LI><a href="pdc/read-it1"> Persistant dispersion chains of length 1</a>
<LI><a href="pdc/read-it2"> Persistant dispersion chains of length 2</a>
<LI><a href="pdc/read-it3"> Persistant dispersion chains of length 3</a>
<LI><a href="pdc/read-it4"> Persistant dispersion chains of length 4</a>
<LI><a href="pdc/read-it5"> Persistant dispersion chains of length 5</a>
<LI><a href="pdc/read-it6"> Persistant dispersion chains of length 6</a>
<LI><a href="pdc/read-it7"> Persistant dispersion chains of length 7</a>
<LI><a href="pdc/read-it8"> Persistant dispersion chains of length 8</a>
<LI><a href="pdc/read-it9"> Persistant dispersion chains of length 9</a>
<LI><a href="pdc/read-it10"> Persistant dispersion chains of length 10</a>
<LI><a href="pdc/read-it11"> Persistant dispersion chains of length 11</a>
<LI><a href="pdc/read-it12"> Persistant dispersion chains of length 12</a>
<LI><a href="pdc/read-it13"> Persistant dispersion chains of length 13</a>
<LI><a href="pdc/read-it14"> Persistant dispersion chains of length 14</a>
<LI><a href="pdc/read-it15"> Persistant dispersion chains of length 15</a>
<LI><a href="pdc/read-it16"> Persistant dispersion chains of length 16</a>
<LI><a href="pdc/read-it17"> Persistant dispersion chains of length 17</a>