I'm starting a new thread (old one was: https://www.statalist.org/forums/for...ific-duplicate) but I think I have a clearer picture of the question I was asking.

I have a lot of duplicated values,

I have companies like this one, which the company had to do two ammendments in that year, and submit it to the sex (10-K/A).
"TREC" 7039 2011 "ARABIAN AMERICAN DEVELOPMENT CO" "10-K/A" "1600 HWY 6 SOUTH, SUITE 240" "SUGAR LAND" "TX" 1
"TREC" 7039 2011 "ARABIAN AMERICAN DEVELOPMENT CO" "10-K/A" "1600 HWY 6 SOUTH, SUITE 240" "SUGAR LAND" "TX" 1

So my question is, how can I get stata to select the newest oldest duplicate in one year and tell it to drop it? That would be, the first duplicate that appears here?

Thank you.

Code:
* Example generated by -dataex-. To install: ssc install dataex
clear
input str7 TIC long CIK int date str72 Company_Conformed_Name str9 Form_Type str40 BA_Street1 str30 BA_City str8 BA_State byte dup
"SSI"  6885 2009 "STAGE STORES INC"                "10-K"   "10201 MAIN ST"                    "HOUSTON"         "TX" 0
"SSI"  6885 2010 "STAGE STORES INC"                "10-K"   "10201 MAIN ST"                    "HOUSTON"         "TX" 0
"SSI"  6885 2011 "STAGE STORES INC"                "10-K"   "10201 MAIN ST"                    "HOUSTON"         "TX" 0
"SSI"  6885 2012 "STAGE STORES INC"                "10-K"   "10201 MAIN ST"                    "HOUSTON"         "TX" 0
"SSI"  6885 2013 "STAGE STORES INC"                "10-K"   "10201 MAIN ST"                    "HOUSTON"         "TX" 0
"SSI"  6885 2014 "STAGE STORES INC"                "10-K"   "10201 MAIN ST"                    "HOUSTON"         "TX" 0
"SSI"  6885 2015 "STAGE STORES INC"                "10-K"   "10201 MAIN ST"                    "HOUSTON"         "TX" 0
"AMAT" 6951 2009 "APPLIED MATERIALS INC /DE"       "10-K"   "3050 BOWERS AVE"                  "SANTA CLARA"     "CA" 0
"AMAT" 6951 2009 "APPLIED MATERIALS INC /DE"       "10-K/A" "3050 BOWERS AVE"                  "SANTA CLARA"     "CA" 0
"AMAT" 6951 2010 "APPLIED MATERIALS INC /DE"       "10-K"   "3050 BOWERS AVE"                  "SANTA CLARA"     "CA" 0
"AMAT" 6951 2011 "APPLIED MATERIALS INC /DE"       "10-K"   "3050 BOWERS AVE"                  "SANTA CLARA"     "CA" 0
"AMAT" 6951 2012 "APPLIED MATERIALS INC /DE"       "10-K"   "3050 BOWERS AVE"                  "SANTA CLARA"     "CA" 0
"AMAT" 6951 2013 "APPLIED MATERIALS INC /DE"       "10-K"   "3050 BOWERS AVE"                  "SANTA CLARA"     "CA" 0
"AMAT" 6951 2014 "APPLIED MATERIALS INC /DE"       "10-K"   "3050 BOWERS AVE"                  "SANTA CLARA"     "CA" 0
"AMAT" 6951 2015 "APPLIED MATERIALS INC /DE"       "10-K"   "3050 BOWERS AVE"                  "SANTA CLARA"     "CA" 0
"ATU"  6955 2009 "ACTUANT CORP"                    "10-K"   "ATTN:  CHAD DELUKA"               "BUTLER"          "WI" 0
"ATU"  6955 2010 "ACTUANT CORP"                    "10-K"   "ATTN:  MATT PAULI"                "BUTLER"          "WI" 0
"ATU"  6955 2011 "ACTUANT CORP"                    "10-K"   "ATTN:  MATT PAULI"                "MENOMONEE FALLS" "WI" 0
"ATU"  6955 2012 "ACTUANT CORP"                    "10-K"   "ATTN:  MATT PAULI"                "MENOMONEE FALLS" "WI" 0
"ATU"  6955 2013 "ACTUANT CORP"                    "10-K"   "ATTN:  MATT PAULI"                "MENOMONEE FALLS" "WI" 0
"ATU"  6955 2014 "ACTUANT CORP"                    "10-K"   "ATTN:  MATT PAULI"                "MENOMONEE FALLS" "WI" 0
"ATU"  6955 2015 "ACTUANT CORP"                    "10-K"   "ATTN:  MATT PAULI"                "MENOMONEE FALLS" "WI" 0
"TREC" 7039 2009 "ARABIAN AMERICAN DEVELOPMENT CO" "10-K"   "10830 N CENTRAL EXPRWY STE 175"   "DALLAS"          "TX" 0
"TREC" 7039 2010 "ARABIAN AMERICAN DEVELOPMENT CO" "10-K"   "7752 FM 418"                      "SILSBEE"         "TX" 0
"TREC" 7039 2011 "ARABIAN AMERICAN DEVELOPMENT CO" "10-K"   "1600 HWY 6 SOUTH, SUITE 240"      "SUGAR LAND"      "TX" 0
"TREC" 7039 2011 "ARABIAN AMERICAN DEVELOPMENT CO" "10-K/A" "1600 HWY 6 SOUTH, SUITE 240"      "SUGAR LAND"      "TX" 1
"TREC" 7039 2011 "ARABIAN AMERICAN DEVELOPMENT CO" "10-K/A" "1600 HWY 6 SOUTH, SUITE 240"      "SUGAR LAND"      "TX" 1
"TREC" 7039 2012 "ARABIAN AMERICAN DEVELOPMENT CO" "10-K"   "1600 HWY 6 SOUTH, SUITE 240"      "SUGAR LAND"      "TX" 0
"TREC" 7039 2013 "ARABIAN AMERICAN DEVELOPMENT CO" "10-K/A" "1650 HWY 6 SOUTH, SUITE 190"      "SUGAR LAND"      "TX" 1
"TREC" 7039 2013 "ARABIAN AMERICAN DEVELOPMENT CO" "10-K/A" "1650 HWY 6 SOUTH, SUITE 190"      "SUGAR LAND"      "TX" 1
"TREC" 7039 2013 "ARABIAN AMERICAN DEVELOPMENT CO" "10-K"   "1650 HWY 6 SOUTH, SUITE 190"      "SUGAR LAND"      "TX" 0
"TREC" 7039 2014 "ARABIAN AMERICAN DEVELOPMENT CO" "10-K"   "1650 HWY 6 SOUTH, SUITE 190"      "SUGAR LAND"      "TX" 0
"TREC" 7039 2015 "TRECORA RESOURCES"               "10-K"   "1650 HWY 6 SOUTH, SUITE 190"      "SUGAR LAND"      "TX" 0
"ADM"  7084 2009 "ARCHER DANIELS MIDLAND CO"       "10-K"   "4666 FARIES PKWY"                 "DECATUR"         "IL" 0
"ADM"  7084 2010 "ARCHER DANIELS MIDLAND CO"       "10-K"   "4666 FARIES PKWY"                 "DECATUR"         "IL" 0
"ADM"  7084 2011 "ARCHER DANIELS MIDLAND CO"       "10-K"   "4666 FARIES PKWY"                 "DECATUR"         "IL" 0
"ADM"  7084 2011 "ARCHER DANIELS MIDLAND CO"       "10-K/A" "4666 FARIES PKWY"                 "DECATUR"         "IL" 0
"ADM"  7084 2012 "ARCHER DANIELS MIDLAND CO"       "10-K"   "4666 FARIES PKWY"                 "DECATUR"         "IL" 0
"ADM"  7084 2013 "ARCHER DANIELS MIDLAND CO"       "10-KT"  "4666 FARIES PKWY"                 "DECATUR"         "IL" 0
"ADM"  7084 2014 "ARCHER DANIELS MIDLAND CO"       "10-K"   "4666 FARIES PKWY"                 "DECATUR"         "IL" 0
"ADM"  7084 2015 "ARCHER DANIELS MIDLAND CO"       "10-K"   "4666 FARIES PKWY"                 "DECATUR"         "IL" 0
"SWN"  7332 2009 "SOUTHWESTERN ENERGY CO"          "10-K"   "2350 N. SAM HOUSTON PARKWAY EAST" "HOUSTON"         "TX" 0
"SWN"  7332 2010 "SOUTHWESTERN ENERGY CO"          "10-K"   "2350 N. SAM HOUSTON PARKWAY EAST" "HOUSTON"         "TX" 0
"SWN"  7332 2011 "SOUTHWESTERN ENERGY CO"          "10-K"   "2350 N. SAM HOUSTON PARKWAY EAST" "HOUSTON"         "TX" 0
"SWN"  7332 2011 "SOUTHWESTERN ENERGY CO"          "10-K/A" "2350 N. SAM HOUSTON PARKWAY EAST" "HOUSTON"         "TX" 0
"SWN"  7332 2012 "SOUTHWESTERN ENERGY CO"          "10-K"   "2350 N. SAM HOUSTON PARKWAY EAST" "HOUSTON"         "TX" 0
"SWN"  7332 2013 "SOUTHWESTERN ENERGY CO"          "10-K"   "2350 N. SAM HOUSTON PARKWAY EAST" "HOUSTON"         "TX" 0
"SWN"  7332 2014 "SOUTHWESTERN ENERGY CO"          "10-K"   "2350 N. SAM HOUSTON PARKWAY EAST" "HOUSTON"         "TX" 0
"SWN"  7332 2015 "SOUTHWESTERN ENERGY CO"          "10-K"   "2350 N. SAM HOUSTON PARKWAY EAST" "HOUSTON"         "TX" 0
"ARW"  7536 2009 "ARROW ELECTRONICS INC"           "10-K"   "25 HUB DR"                        "MELVILLE"        "NY" 0
"ARW"  7536 2010 "ARROW ELECTRONICS INC"           "10-K"   "25 HUB DR"                        "MELVILLE"        "NY" 0
"ARW"  7536 2011 "ARROW ELECTRONICS INC"           "10-K"   "25 HUB DR"                        "MELVILLE"        "NY" 0
"ARW"  7536 2012 "ARROW ELECTRONICS INC"           "10-K"   "25 HUB DR"                        "MELVILLE"        "NY" 0
"ARW"  7536 2013 "ARROW ELECTRONICS INC"           "10-K"   "25 HUB DR"                        "MELVILLE"        "NY" 0
"ARW"  7536 2014 "ARROW ELECTRONICS INC"           "10-K"   "25 HUB DR"                        "MELVILLE"        "NY" 0
"ARW"  7536 2015 "ARROW ELECTRONICS INC"           "10-K"   "9201 EAST DRY CREEK ROAD"         "CENTENNIAL"      "CO" 0
"ATRO" 8063 2009 "ASTRONICS CORP"                  "10-K"   "130 COMMERCE WAY"                 "EAST AURORA"     "NY" 0
"ATRO" 8063 2010 "ASTRONICS CORP"                  "10-K"   "130 COMMERCE WAY"                 "EAST AURORA"     "NY" 0
"ATRO" 8063 2011 "ASTRONICS CORP"                  "10-K"   "130 COMMERCE WAY"                 "EAST AURORA"     "NY" 0
"ATRO" 8063 2012 "ASTRONICS CORP"                  "10-K"   "130 COMMERCE WAY"                 "EAST AURORA"     "NY" 0
"ATRO" 8063 2013 "ASTRONICS CORP"                  "10-K"   "130 COMMERCE WAY"                 "EAST AURORA"     "NY" 0
"ATRO" 8063 2014 "ASTRONICS CORP"                  "10-K/A" "130 COMMERCE WAY"                 "EAST AURORA"     "NY" 0
"ATRO" 8063 2014 "ASTRONICS CORP"                  "10-K"   "130 COMMERCE WAY"                 "EAST AURORA"     "NY" 0
"ATRO" 8063 2015 "ASTRONICS CORP"                  "10-K"   "130 COMMERCE WAY"                 "EAST AURORA"     "NY" 0
"ADP"  8670 2009 "AUTOMATIC DATA PROCESSING INC"   "10-K"   "ONE ADP BOULVARD"                 "ROSELAND"        "NJ" 0
"ADP"  8670 2010 "AUTOMATIC DATA PROCESSING INC"   "10-K"   "ONE ADP BOULVARD"                 "ROSELAND"        "NJ" 0
"ADP"  8670 2011 "AUTOMATIC DATA PROCESSING INC"   "10-K"   "ONE ADP BOULVARD"                 "ROSELAND"        "NJ" 0
"ADP"  8670 2012 "AUTOMATIC DATA PROCESSING INC"   "10-K"   "ONE ADP BOULVARD"                 "ROSELAND"        "NJ" 0
"ADP"  8670 2013 "AUTOMATIC DATA PROCESSING INC"   "10-K"   "ONE ADP BOULVARD"                 "ROSELAND"        "NJ" 0
"ADP"  8670 2014 "AUTOMATIC DATA PROCESSING INC"   "10-K"   "ONE ADP BOULVARD"                 "ROSELAND"        "NJ" 0
"ADP"  8670 2015 "AUTOMATIC DATA PROCESSING INC"   "10-K"   "ONE ADP BOULVARD"                 "ROSELAND"        "NJ" 0
"AVY"  8818 2009 "AVERY DENNISON CORPORATION"      "10-K"   "150 N ORANGE GROVE BLVD"          "PASADENA"        "CA" 0
"AVY"  8818 2010 "AVERY DENNISON CORPORATION"      "10-K"   "150 N ORANGE GROVE BLVD"          "PASADENA"        "CA" 0
"AVY"  8818 2011 "AVERY DENNISON CORPORATION"      "10-K"   "150 N ORANGE GROVE BLVD"          "PASADENA"        "CA" 0
"AVY"  8818 2012 "Avery Dennison Corp"             "10-K"   "150 N ORANGE GROVE BLVD"          "PASADENA"        "CA" 0
"AVY"  8818 2013 "Avery Dennison Corp"             "10-K"   "150 N ORANGE GROVE BLVD"          "PASADENA"        "CA" 0
"AVY"  8818 2014 "Avery Dennison Corp"             "10-K"   "207 GOODE AVENUE"                 "GLENDALE"        "CA" 0
"AVY"  8818 2015 "Avery Dennison Corp"             "10-K"   "207 GOODE AVENUE"                 "GLENDALE"        "CA" 0
"AVT"  8858 2009 "AVNET INC"                       "10-K"   "2211 SOUTH 47TH STREET"           "PHOENIX"         "AZ" 0
"AVT"  8858 2010 "AVNET INC"                       "10-K"   "2211 SOUTH 47TH STREET"           "PHOENIX"         "AZ" 0
"AVT"  8858 2011 "AVNET INC"                       "10-K"   "2211 SOUTH 47TH STREET"           "PHOENIX"         "AZ" 0
"AVT"  8858 2011 "AVNET INC"                       "10-K/A" "2211 SOUTH 47TH STREET"           "PHOENIX"         "AZ" 0
"AVT"  8858 2012 "AVNET INC"                       "10-K"   "2211 SOUTH 47TH STREET"           "PHOENIX"         "AZ" 0
"AVT"  8858 2013 "AVNET INC"                       "10-K"   "2211 SOUTH 47TH STREET"           "PHOENIX"         "AZ" 0
"AVT"  8858 2014 "AVNET INC"                       "10-K"   "2211 SOUTH 47TH STREET"           "PHOENIX"         "AZ" 0
"AVT"  8858 2015 "AVNET INC"                       "10-K"   "2211 SOUTH 47TH STREET"           "PHOENIX"         "AZ" 0
"AVP"  8868 2009 "AVON PRODUCTS INC"               "10-K"   "1345 AVENUE OF THE AMERICAS"      "NEW YORK"        "NY" 0
"AVP"  8868 2010 "AVON PRODUCTS INC"               "10-K"   "1345 AVENUE OF THE AMERICAS"      "NEW YORK"        "NY" 0
"AVP"  8868 2011 "AVON PRODUCTS INC"               "10-K"   "1345 AVENUE OF THE AMERICAS"      "NEW YORK"        "NY" 0
"AVP"  8868 2012 "AVON PRODUCTS INC"               "10-K"   "1345 AVENUE OF THE AMERICAS"      "NEW YORK"        "NY" 0
"AVP"  8868 2013 "AVON PRODUCTS INC"               "10-K/A" "1345 AVENUE OF THE AMERICAS"      "NEW YORK"        "NY" 0
"AVP"  8868 2013 "AVON PRODUCTS INC"               "10-K"   "1345 AVENUE OF THE AMERICAS"      "NEW YORK"        "NY" 0
"AVP"  8868 2014 "AVON PRODUCTS INC"               "10-K"   "777 THIRD AVENUE"                 "NEW  YORK"       "NY" 0
"AVP"  8868 2015 "AVON PRODUCTS INC"               "10-K"   "777 THIRD AVENUE"                 "NEW  YORK"       "NY" 0
"AZZ"  8947 2009 "AZZ INC"                         "10-K"   "ONE MUSEUM PLACE, SUITE 500"      "FORT WORTH"      "TX" 0
"AZZ"  8947 2009 "AZZ INC"                         "10-K/A" "ONE MUSEUM PLACE, SUITE 500"      "FORT WORTH"      "TX" 0
"AZZ"  8947 2010 "AZZ INC"                         "10-K"   "ONE MUSEUM PLACE, SUITE 500"      "FORT WORTH"      "TX" 0
"AZZ"  8947 2011 "AZZ INC"                         "10-K"   "ONE MUSEUM PLACE, SUITE 500"      "FORT WORTH"      "TX" 0
"AZZ"  8947 2011 "AZZ INC"                         "10-K/A" "ONE MUSEUM PLACE, SUITE 500"      "FORT WORTH"      "TX" 0
"AZZ"  8947 2012 "AZZ INC"                         "10-K"   "ONE MUSEUM PLACE, SUITE 500"      "FORT WORTH"      "TX" 0
end