title: Extracting lines using two criteria
body: <p>Hoping somebody can teach me how to do this task. </p>
  
  <p>I am thinking awk might be good to do this, but I am really beginner. </p>
  
  <p>I have a file like below (tab separated, actual file is much bigger). 
  Here, important columns are second and ninth (235 and 15 in the first line of the file). </p>
  
  <pre><code>S   235 1365    *   0   *   *   *   15  1   c81 592
  H   235 296 99.7    +   0   0   3I296M1066I 14  1   s15018  1
  H   235 719 95.4    +   0   0   174D545M820I    15  1   c2664   10
  H   235 764 99.1    +   0   0   55I764M546I 15  1   c6519   4
  H   235 792 100 +   0   0   180I792M393I    14  1   c407    107
  S   236 1365    *   0   *   *   *   15  1   c474    152
  H   236 279 95  +   0   0   765I279M321I    10-1    1   s7689   1
  H   236 301 99.7    -   0   0   908I301M156I    15  1   s8443   1
  H   236 563 95.2    -   0   0   728I563M74I 17  1   c1725   12
  H   236 97  97.9    -   0   0   732I97M536I 17  1   s11472  1
  </code></pre>
  
  <p>I would like to extract lines by specifying the value of ninth columns. At this time, second columns will be like pivot column. What I mean pivot column is, consider as a single set of data if second column has same value. And within the set of lines, all lines need to have the specific values in the ninth column. </p>
  
  <p>So, for example, if I specify ninth column "14" and "15". Then out put will be.  </p>
  
  <pre><code>S   235 1365    *   0   *   *   *   15  1   c81 592
  H   235 296 99.7    +   0   0   3I296M1066I 14  1   s15018  1
  H   235 719 95.4    +   0   0   174D545M820I    15  1   c2664   10
  H   235 764 99.1    +   0   0   55I764M546I 15  1   c6519   4
  H   235 792 100 +   0   0   180I792M393I    14  1   c407    107
  </code></pre>
  
  <p>6th and 8th lines have "15" in their ninth column, but other lines in the "set" (specified by second column: 236) have values other than "14" or "15", so I do not want to extract the lines. </p>