Description: Fix spelling errors.
 hierachical -> hierarchical
 occurence   -> occurrence
Author: Bas Couwenberg <sebastic@debian.org>

--- a/TFBS/PatternGen/YMF.pm
+++ b/TFBS/PatternGen/YMF.pm
@@ -177,7 +177,7 @@
         my $motif =TFBS::PatternGen::YMF::Motif->new
                     (-word=>$word,
                     -tags => {z_score=>$z_score,
-                            'occurences'=>$occ,
+                            'occurrences'=>$occ,
                      'expectation value'=>$expect,
                      'variance'=>$var}
                         );
@@ -190,4 +190,4 @@
 }
 #
 
-1;
\ No newline at end of file
+1;
--- a/TFBS/MatrixSet.pm
+++ b/TFBS/MatrixSet.pm
@@ -763,7 +763,7 @@
  Title   : cluster
  Usage   : $matrixset->cluster(%args)
  Function: Clusters the matrices in the set
- Returns : The root node of the hierachical clustering tree. 
+ Returns : The root node of the hierarchical clustering tree. 
            An integer specifying the optimal number of clusters.
            An array of TFBS::MatrixSets, one for each cluster.
  Args    : Many:
--- a/TFBS/Matrix/PFM.pm
+++ b/TFBS/Matrix/PFM.pm
@@ -366,7 +366,7 @@
                                     # "pseudocounts" - standard pseudocount 
                                     #   correction,  more suitable for 
                                     #   PFMs with large r column sums
-                                    # If the parameter is ommited, small
+                                    # If the parameter is omitted, small
                                     # sample correction is not applied
 
            -draw_error_bars         # if true, adds error bars to each position