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https://www.slideshare.net/maheshkodit1/input-and-output-devices-33585882
https://www.slideshare.net/rajith89/ss-10315299
https://www.slideshare.net/maheshkodit1/pascal-programming-language
https://www.slideshare.net/maheshkodit1/grade-10-ict-short-notes-in-sinhala2015
