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my $UsedRows = 0+$Sheet->UsedRange->{Rows}->{Count};
my $FirstRow = 0+$Sheet->UsedRange->Rows(1)->{Row};
...
my $UsedCols = 0+$Sheet->UsedRange->{Columns}->{Count};
my $FirstCol = 0+$Sheet->UsedRange->Columns(1)->{Column};
my $LastCol  = $FirstCol + $UsedCols - 1;