0 01i 00On02i 00 and 01i 00in02i 00 have many definitions. Some of them from 01i 00Webster's Third New International Dictionary02i 00 [W]and the 01i 00American Heritage Dictionary02i 00 (AHD) are 02br 02br 01b 00on : 02b 02br 00with regard to, with reference to, with relation to ---(W) 02br 00concerning, about ---(AHD) 02br 02br 01b 00in : 02b 02br 00with reference to, as concerns ---(W) 02br 00within the category or class of, with reference to, as regards ---(AHD) 02br 02br 00So either 01i 00in02i 00 or 01i 00on02i 00 would work. 02br 02br 00In the contexts of these sentences, 01i 00additional02i 00 and 01i 00extra02i 00 are virtually identical synonyms.
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