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while (my $data = $ss->getNextRow()) {
   # skip lines until we find column header "Last Name" in first colum
+n
...

   ... stuff ...
}

while (my $data = $ss->getNextRow()) {
   # skip lines until we find a non-blank row
...

   ... stuff ...
}

while (my $data = $ss->getNextRow()) {
   # skip lines unless they have the right number of columns
...

   ... stuff ...
}