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1: https://www.examveda.com/which-of-the-following-type-attributes-of-input-element-defines-control-for-entering-a-telephone-number-39489/
2: https://textbooks.elsevier.com/manualsprotectedtextbooks/9780123742681/Instructor_Manual.pdf
3: https://bmchealthservres.biomedcentral.com/articles/10.1186/s12913-020-05899-8
4: https://quizlet.com/305460959/telephony-and-mobile-communications-1-flash-cards/?funnelUUID=aa716c36-c360-4e2c-b230-5be402e7ddfa
5: https://qna.talkjarvis.com/24025/which-following-type-attributes-input-element-defines-control-entering-telephone-number
6: https://quizlet.com/457322255/com-3332-seibert-fsu-test-6-flash-cards/
7: https://pinoybix.org/2017/07/mcq-in-wireless-wans-cellular-telephone-and-satellite-networks.html
8: https://jesushilarioh.com/chapter-4-25-mobile-service-provider-tony-gaddis-starting-out-with-c-plus-plus/
9: https://www.clarkecounty.gov/home/showpublisheddocument/4630/637034031203130000
10: https://interviewmania.com/discussion/37399-html-html-miscellaneous
11: https://mhl.org/sites/default/files/newspapers/ATM-1908-03.pdf