Title	Sentiment Analysis of COVID-19 Tweets: Impact of Pre-processing Step
Author	Rami Ayadi, Osama R.Shahin, Osama Ghorbel, Rayan Alanazi, and Anouar Saidi
Citation	Vol. 21  No. 3  pp. 206-211
Keywords	C.ovid-19, Sentiment Analysis, Covid-19 Tweets, SVM, KNN, pre-processing step, Arabic Language

Title	The Importance of International Transport and Logistics Infrastructure in the Economic Development of the Country: The Case of the EU for Ukraine
Author	Yuliia Atamanenko, Olena Komchatnykh, Sukhomlyn Larysa, Didkivskyi Viacheslav, Borys Sulym, Oksana Losheniuk
Citation	Vol. 21  No. 3  pp. 198-205
Keywords	EU Transport System, EU Logistics Efficiency, Intermodal Transport Market, Sustainability of Transport Infrastructure.

Title	Development of the Agro-Industrial Complex for Improving the Economic Security of the State
Author	Iaroslav Petrunenko, Borys Pohrishcuk, Maryna Abramova, Yurii Vlasenko, Vasyl Halkin
Citation	Vol. 21  No. 3  pp. 191-197
Keywords	Economy, Economic Security, Food Security, Agro-Industrial Complex, Agriculture, Employment, Labour Productivity, Export.

Title	Theoretical Aspects of Blockchain Technologies in The Sphere of Education
Author	Antonina Liashkevych, Mariana Babyshena, Oleksandr Vorokhaev, Volodymyr Pylypiv, Oksana Oliinyk, Nelia Kinakh
Citation	Vol. 21  No. 3  pp. 185-190
Keywords	Information technology, pedagogy, Higher Education, Education System, Technologies Blockchain, Methodology.