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If you make a singleplayer world and go to ''More world options...'' then click on the button that says '' World type: Default'' then clickon the button until it says ''World type: Custom''then click on ''Customize'' then go to the page where you can do things whit ores. Go to the next page and click on ''Presets''
then choose what type of Preset you want, go back and create the world and...... DONE