Google sheets script for highlighting all duplicates, except for FIRST instance

thescript

//Modify the parameters i and j to capture the range of your sheet. J indicates rows and i indicates columns

function appendString() {
  var sheet = SpreadsheetApp.getActiveSpreadsheet().getActiveSheet();
  
  var map = {};
  for (var j = 1; j < 119; j++) 
  {
    
    for (var i = 1; i < 10; i++) 
    {
      var currentValue = sheet.getRange(j,i).getValue();
      
      
      if (!currentValue==""){
        
      if (currentValue in map)
      {
        sheet.getRange(j,i).setBackground("pink"); 
      }
      else
      map[currentValue] = 1;
      
      }
    }
  }
}