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src=\"https:\/\/calypso.media.uoa.gr\/datastories\/wp-content\/uploads\/2026\/07\/neCcd-\u03c0\u03b5\u03c1\u03b9\u03bf\u03c7\u03ad\u03c2-\u03c0\u03bf\u03c5-\u03b4\u03ad\u03c7\u03bf\u03bd\u03c4\u03b1\u03b9-\u03c0\u03b9\u03bf-\u03c3\u03c5\u03c7\u03bd\u03ac-\u03c7\u03c1\u03b7\u03bc\u03b1\u03c4\u03bf\u03b4\u03cc\u03c4\u03b7\u03c3\u03b7-\u03b3\u03b9\u03b1-\u03c4\u03b9\u03c2-\u03c3\u03c7\u03bf\u03bb\u03b9\u03ba\u03ad\u03c2-\u03c5\u03c0\u03bf\u03b4\u03bf\u03bc\u03ad\u03c2-nbsp-1-1.png\" alt=\"\" class=\"wp-image-9373\" style=\"object-fit:cover;width:782px;height:auto\" \/><figcaption class=\"wp-element-caption\">\u03a7\u03ac\u03c1\u03c4\u03b7\u03c2 \u03bc\u03b5 \u03b1\u03bd\u03b1\u03c0\u03b1\u03c1\u03ac\u03c3\u03c4\u03b1\u03c3\u03b7 \u03c4\u03c9\u03bd \u03c0\u03b5\u03c1\u03b9\u03bf\u03c7\u03ce\u03bd \u03c0\u03bf\u03c5 \u03b4\u03ad\u03c7\u03bf\u03bd\u03c4\u03b1\u03b9 \u03c0\u03b9\u03bf \u03c3\u03c5\u03c7\u03bd\u03ac \u03c7\u03c1\u03b7\u03bc\u03b1\u03c4\u03bf\u03b4\u03cc\u03c4\u03b7\u03c3\u03b7 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\u03c7\u03b9\u03bb\u03b9\u03ac\u03b4\u03b5\u03c2 \u03c3\u03c7\u03bf\u03bb\u03b5\u03af\u03b1, \u03c4\u03b7\u03bd \u03bf\u03c0\u03bf\u03af\u03b1 \u03c3\u03c5\u03bd\u03bf\u03b4\u03b5\u03cd\u03b5\u03b9 \u03cd\u03c3\u03c4\u03b5\u03c1\u03b1 \u03b7 \u0398\u03b5\u03c3\u03c3\u03b1\u03bb\u03bf\u03bd\u03af\u03ba\u03b7.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"2092\" height=\"1182\" src=\"https:\/\/calypso.media.uoa.gr\/datastories\/wp-content\/uploads\/2026\/07\/HCLfp-\u03c7\u03c1\u03b7\u03bc\u03b1\u03c4\u03bf\u03b4\u03cc\u03c4\u03b7\u03c3\u03b7-\u03c3\u03c7\u03bf\u03bb\u03b5\u03af\u03c9\u03bd-\u03b1\u03bd\u03ac-\u03b4\u03ae\u03bc\u03bf-nbsp-.png\" alt=\"\" class=\"wp-image-9374\" style=\"width:824px;height:auto\" \/><figcaption class=\"wp-element-caption\">\u0394\u03b9\u03ac\u03b3\u03c1\u03b1\u03bc\u03bc\u03b1 \u03bc\u03b5 \u03c4\u03b1 \u03c0\u03bf\u03c3\u03ac 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is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1448\" height=\"946\" src=\"https:\/\/calypso.media.uoa.gr\/datastories\/wp-content\/uploads\/2026\/07\/tfsBK-\u03c0\u03bf\u03c3\u03ac-\u03c7\u03c1\u03b7\u03bc\u03b1\u03c4\u03bf\u03b4\u03cc\u03c4\u03b7\u03c3\u03b7\u03c2-\u03c3\u03c7\u03bf\u03bb\u03b5\u03af\u03c9\u03bd-\u03b1\u03bd\u03ac-\u03c7\u03c1\u03bf\u03bd\u03b9\u03ac-.png\" alt=\"\" class=\"wp-image-9375\" style=\"width:787px;height:auto\" \/><figcaption class=\"wp-element-caption\">\u0394\u03b9\u03ac\u03b3\u03c1\u03b1\u03bc\u03bc\u03b1 \u03bc\u03b5 \u03c4\u03b1 \u03c0\u03bf\u03c3\u03ac \u03c7\u03c1\u03b7\u03bc\u03b1\u03c4\u03bf\u03b4\u03cc\u03c4\u03b7\u03c3\u03b7\u03c2 \u03b1\u03bd\u03ac \u03ad\u03c4\u03bf\u03c2<\/figcaption><\/figure>\n\n\n\n<p>\u03a9\u03c3\u03c4\u03cc\u03c3\u03bf, \u03c3\u03c5\u03bd\u03bf\u03bb\u03b9\u03ba\u03ac \u03c0\u03bf\u03c3\u03ac \u03c0\u03bf\u03c5 \u03ad\u03c7\u03bf\u03c5\u03bd \u03b4\u03bf\u03b8\u03b5\u03af \u03b1\u03bd\u03ac 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src=\"https:\/\/calypso.media.uoa.gr\/datastories\/wp-content\/uploads\/2026\/07\/YAHW9-\u03c3\u03c7\u03bf\u03bb\u03b9\u03ba\u03ad\u03c2-\u03b2\u03b1\u03b8\u03bc\u03af\u03b4\u03b5\u03c2-\u03c0\u03bf\u03c5-\u03ad\u03c7\u03bf\u03c5\u03bd-\u03b1\u03c0\u03b1\u03c3\u03c7\u03bf\u03bb\u03ae\u03c3\u03b5\u03b9-\u03c3\u03c4\u03b7\u03bd-\u03c7\u03c1\u03b7\u03bc\u03b1\u03c4\u03bf\u03b4\u03cc\u03c4\u03b7\u03c3\u03b7-.png\" alt=\"\" class=\"wp-image-9376\" style=\"width:826px;height:auto\" \/><figcaption class=\"wp-element-caption\">\u03a0\u03bf\u03b9\u03b5\u03c2 \u03c3\u03c7\u03bf\u03bb\u03b9\u03ba\u03ad\u03c2 \u03b2\u03b1\u03b8\u03bc\u03af\u03b4\u03b5\u03c2 \u03ad\u03c7\u03bf\u03c5\u03bd \u03b1\u03c0\u03b1\u03c3\u03c7\u03bf\u03bb\u03ae\u03c3\u03b5\u03b9 \u03c0\u03b5\u03c1\u03b9\u03c3\u03c3\u03cc\u03c4\u03b5\u03c1\u03bf<\/figcaption><\/figure>\n\n\n\n<p>\u038c\u03c3\u03bf\u03bd \u03b1\u03c6\u03bf\u03c1\u03ac \u03c4\u03bf \u03b3\u03b9\u03b1 \u03c0\u03bf\u03b9\u03b5\u03c2 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class=\"wp-image-9377\" style=\"width:953px;height:auto\" \/><\/figure>\n\n\n\n<p>\u03a3\u03c5\u03bd\u03bf\u03c8\u03af\u03b6\u03bf\u03bd\u03c4\u03b1\u03c2, \u03c4\u03b1 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03b1 \u03c4\u03c9\u03bd \u03c4\u03b5\u03bb\u03b5\u03c5\u03c4\u03b1\u03af\u03c9\u03bd \u03ad\u03be\u03b9 \u03b5\u03c4\u03ce\u03bd \u03b4\u03b5\u03af\u03c7\u03bd\u03bf\u03c5\u03bd \u03cc\u03c4\u03b9 \u03c4\u03bf \u03ba\u03c1\u03ac\u03c4\u03bf\u03c2 \u03b5\u03ba\u03c4\u03b1\u03bc\u03b9\u03b5\u03cd\u03b5\u03b9 \u03c3\u03b7\u03bc\u03b1\u03bd\u03c4\u03b9\u03ba\u03bf\u03cd\u03c2 \u03c0\u03cc\u03c1\u03bf\u03c5\u03c2, \u03cc\u03bc\u03c9\u03c2 \u03b7 \u03c3\u03c4\u03b1\u03c4\u03b9\u03c3\u03c4\u03b9\u03ba\u03ae \u03b4\u03b5\u03bd \u03bc\u03c0\u03bf\u03c1\u03b5\u03af \u03bd\u03b1 \u03b1\u03c0\u03bf\u03b4\u03ce\u03c3\u03b5\u03b9 \u03c4\u03b7\u03bd \u03c0\u03bf\u03b9\u03cc\u03c4\u03b7\u03c4\u03b1 \u03c4\u03b7\u03c2 \u03ba\u03b1\u03b8\u03b7\u03bc\u03b5\u03c1\u03b9\u03bd\u03cc\u03c4\u03b7\u03c4\u03b1\u03c2 \u03c4\u03c9\u03bd \u03bc\u03b1\u03b8\u03b7\u03c4\u03ce\u03bd. \u0397 \u03b1\u03bd\u03ac\u03bb\u03c5\u03c3\u03b7 \u03c4\u03c9\u03bd \u03ba\u03c1\u03b1\u03c4\u03b9\u03ba\u03ce\u03bd \u03b5\u03b3\u03b3\u03c1\u03ac\u03c6\u03c9\u03bd \u03b4\u03b5\u03bd \u03b5\u03af\u03bd\u03b1\u03b9 \u03c4\u03bf \u03c4\u03ad\u03bb\u03bf\u03c2 \u03c4\u03b7\u03c2 \u03b4\u03b9\u03b1\u03b4\u03c1\u03bf\u03bc\u03ae\u03c2, \u03b1\u03bb\u03bb\u03ac \u03b7 \u03b1\u03c6\u03b5\u03c4\u03b7\u03c1\u03af\u03b1 \u03b3\u03b9\u03b1 \u03bd\u03b1 \u03b1\u03c0\u03b1\u03b9\u03c4\u03ae\u03c3\u03bf\u03c5\u03bc\u03b5 \u03bc\u03b9\u03b1 \u03b5\u03ba\u03c0\u03b1\u03af\u03b4\u03b5\u03c5\u03c3\u03b7 \u03c0\u03bf\u03c5 \u03b4\u03b5\u03bd \u03b8\u03b1 \u03c3\u03c4\u03b5\u03b3\u03ac\u03b6\u03b5\u03c4\u03b1\u03b9 \u03b1\u03c0\u03bb\u03ce\u03c2 \u03c3\u03b5 \u03bb\u03b5\u03b9\u03c4\u03bf\u03c5\u03c1\u03b3\u03b9\u03ba\u03ac \u03ba\u03c4\u03af\u03c1\u03b9\u03b1, \u03b1\u03bb\u03bb\u03ac \u03c3\u03b5 \u03c0\u03b5\u03c1\u03b9\u03b2\u03ac\u03bb\u03bb\u03bf\u03bd\u03c4\u03b1 \u03c0\u03bf\u03c5 \u03b5\u03bc\u03c0\u03bd\u03ad\u03bf\u03c5\u03bd. \u0397 \u03b4\u03b9\u03b1\u03c6\u03ac\u03bd\u03b5\u03b9\u03b1 \u03c4\u03b7\u03c2 \u03c0\u03bb\u03b7\u03c1\u03bf\u03c6\u03bf\u03c1\u03af\u03b1\u03c2 \u03b5\u03af\u03bd\u03b1\u03b9 \u03c0\u03bb\u03ad\u03bf\u03bd \u03c4\u03bf \u03b4\u03b9\u03ba\u03cc \u03bc\u03b1\u03c2 \u03cc\u03c0\u03bb\u03bf \u03b3\u03b9\u03b1 \u03bd\u03b1 \u03bc\u03b5\u03c4\u03b1\u03c4\u03c1\u03ad\u03c8\u03bf\u03c5\u03bc\u03b5 \u03c4\u03bf\u03c5\u03c2 \u03b1\u03c1\u03b9\u03b8\u03bc\u03bf\u03cd\u03c2 \u03c4\u03b7\u03c2 \u0394\u03b9\u03b1\u03cd\u03b3\u03b5\u03b9\u03b1\u03c2 \u03c3\u03b5 \u03b1\u03c3\u03c6\u03b1\u03bb\u03ae \u03b8\u03c1\u03b1\u03bd\u03af\u03b1.<\/p>\n\n\n\n<p>Background facts<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u03a7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03ae\u03b8\u03b7\u03ba\u03b5 \u03b7 \u03b3\u03bb\u03ce\u03c3\u03c3\u03b1 Python \u03b3\u03b9\u03b1 \u03c4\u03b7\u03bd \u03b1\u03bd\u03ac\u03bb\u03c5\u03c3\u03b7 \u03c4\u03c9\u03bd \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd<\/li>\n\n\n\n<li>\u03a4\u03b1 \u03b1\u03c1\u03c7\u03b5\u03af\u03b1 \u03bc\u03b5 \u03c4\u03b1 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03b1 \u03b5\u03af\u03bd\u03b1\u03b9 \u03b4\u03b9\u03b1\u03b8\u03ad\u03c3\u03b9\u03bc\u03b1:&nbsp;<a href=\"https:\/\/vasilikiliggou.github.io\/diavgeias\/%CE%A7%CF%81%CE%B7%CE%BC%CE%B1%CF%84%CE%BF%CE%B4%CE%BF%CF%84%CE%B7%CF%83%CE%B7%20%CF%83%CF%87%CE%BF%CE%BB%CE%B5%CE%AF%CF%89%CE%BD%20Python%20-%20data_clean.csv\">CSV<\/a>&nbsp;\u03ba\u03b1\u03b9&nbsp;<a href=\"https:\/\/vasilikiliggou.github.io\/diavgeias\/%CE%A7%CF%81%CE%B7%CE%BC%CE%B1%CF%84%CE%BF%CE%B4%CE%BF%CF%84%CE%B7%CF%83%CE%B7-%CF%83%CF%87%CE%BF%CE%BB%CE%B5%CE%AF%CF%89%CE%BD-Python-data_clean.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">PDF<\/a>.<\/li>\n\n\n\n<li>\u03a4\u03bf link \u03c4\u03bf\u03c5 \u03ba\u03ce\u03b4\u03b9\u03ba\u03b1 \u03bc\u03b5 \u03c4\u03bf \u03bf\u03c0\u03bf\u03af\u03bf \u03b1\u03bd\u03c4\u03bb\u03ae\u03b8\u03b7\u03ba\u03b1\u03bd \u03c4\u03b1 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03b1 \u03b5\u03af\u03bd\u03b1\u03b9 \u03b5\u03b4\u03ce:&nbsp;<a href=\"https:\/\/colab.research.google.com\/drive\/1Z6VMEBfv98vGSUl981n_qkeSDBoGX6Sn#scrollTo=ScZemM851RsM\">Data Link<\/a><\/li>\n<\/ul>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u0397 \u03b5\u03be\u03ad\u03c4\u03b1\u03c3\u03b7 \u03c4\u03b7\u03c2 \u03c7\u03c1\u03b7\u03bc\u03b1\u03c4\u03bf\u03b4\u03cc\u03c4\u03b7\u03c3\u03b7\u03c2 \u03c4\u03c9\u03bd \u03c5\u03c0\u03bf\u03b4\u03bf\u03bc\u03ce\u03bd \u03c4\u03c9\u03bd \u03c3\u03c7\u03bf\u03bb\u03b9\u03ba\u03ce\u03bd \u03bc\u03bf\u03bd\u03ac\u03b4\u03c9\u03bd \u03c4\u03b7\u03c2 \u03c7\u03ce\u03c1\u03b1\u03c2 \u03b1\u03c0\u03cc \u03c4\u03bf \u03ba\u03c1\u03ac\u03c4\u03bf\u03c2. \u03a0\u03cc\u03c3\u03b1 \u03c7\u03c1\u03ae\u03bc\u03b1\u03c4\u03b1 \u03b4\u03af\u03bd\u03bf\u03bd\u03c4\u03b1\u03b9, \u03b3\u03b9\u03b1 \u03c0\u03bf\u03b9\u03bf\u03bd \u03bb\u03cc\u03b3\u03bf, \u03ba\u03ac\u03b8\u03b5 \u03c0\u03cc\u03c4\u03b5 \u03ba\u03b1\u03b9 \u03c0\u03bf\u03cd. \u0394\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03b1 \u03b1\u03c0\u03cc \u03c4\u03b7\u03bd \u03b9\u03c3\u03c4\u03bf\u03c3\u03b5\u03bb\u03af\u03b4\u03b1 \u03c4\u03b7\u03c2 \u0394\u03b9\u03b1\u03cd\u03b3\u03b5\u03b9\u03b1\u03c2. \u03a4\u03bf \u03ba\u03c1\u03ac\u03c4\u03bf\u03c2 \u03ad\u03c7\u03b5\u03b9 \u03c5\u03c0\u03bf\u03c7\u03c1\u03ad\u03c9\u03c3\u03b7 \u03c0\u03c1\u03bf\u03c2 \u03c4\u03bf\u03c5\u03c2 \u03c0\u03bf\u03bb\u03af\u03c4\u03b5\u03c2 \u03ba\u03b1\u03b9 \u03b5\u03b9\u03b4\u03b9\u03ba\u03cc\u03c4\u03b5\u03c1\u03b1 \u03c0\u03c1\u03bf\u03c2 \u03c3\u03c4\u03b1 \u03c0\u03b1\u03b9\u03b4\u03b9\u03ac \u03bd\u03b1 \u03bc\u03b5\u03c1\u03b9\u03bc\u03bd\u03ac \u03b3\u03b9 \u03b1\u03c5\u03c4\u03ac. \u0397 \u03b5\u03ba\u03c0\u03b1\u03af\u03b4\u03b5\u03c5\u03c3\u03b7 \u03b5\u03af\u03bd\u03b1\u03b9 \u03bf \u03c0\u03c5\u03c1\u03ae\u03bd\u03b1\u03c2 \u03b3\u03b9\u03b1 \u03c4\u03b7\u03bd \u03b4\u03b9\u03b1\u03bc\u03cc\u03c1\u03c6\u03c9\u03c3\u03b7 \u03b1\u03bd\u03b8\u03c1\u03ce\u03c0\u03c9\u03bd [&hellip;]<\/p>\n","protected":false},"author":141,"featured_media":9370,"comment_status":"closed","ping_status":"open","sticky":false,"template":"single-wide.php","format":"standard","meta":{"_eb_attr":"","newspack_featured_image_position":"","newspack_post_subtitle":"","newspack_article_summary_title":"Overview:","newspack_article_summary":"","newspack_hide_updated_date":false,"footnotes":""},"categories":[9,6],"tags":[519,515,516,518],"ppma_author":[509],"class_list":["post-9369","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-_greece","category-_society","tag-2026ba","tag-515","tag-516","tag-518","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u0391\u03bd\u03ac\u03bb\u03c5\u03c3\u03b7 \u0394\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd: \u0397 \u03c7\u03c1\u03b7\u03bc\u03b1\u03c4\u03bf\u03b4\u03cc\u03c4\u03b7\u03c3\u03b7 \u03c4\u03c9\u03bd \u03c3\u03c7\u03bf\u03bb\u03b9\u03ba\u03ce\u03bd \u03c5\u03c0\u03bf\u03b4\u03bf\u03bc\u03ce\u03bd - Data Stories @ NewTech Lab<\/title>\n<meta name=\"description\" content=\"\u0397 \u03b5\u03be\u03ad\u03c4\u03b1\u03c3\u03b7 \u03c4\u03b7\u03c2 \u03c7\u03c1\u03b7\u03bc\u03b1\u03c4\u03bf\u03b4\u03cc\u03c4\u03b7\u03c3\u03b7\u03c2 \u03c4\u03c9\u03bd \u03c5\u03c0\u03bf\u03b4\u03bf\u03bc\u03ce\u03bd \u03c4\u03c9\u03bd \u03c3\u03c7\u03bf\u03bb\u03b9\u03ba\u03ce\u03bd \u03bc\u03bf\u03bd\u03ac\u03b4\u03c9\u03bd \u03c4\u03b7\u03c2 \u03c7\u03ce\u03c1\u03b1\u03c2 \u03b1\u03c0\u03cc \u03c4\u03bf \u03ba\u03c1\u03ac\u03c4\u03bf\u03c2.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/calypso.media.uoa.gr\/datastories\/analysi-dedomenw-h-xrhmatodothsh-twn-sxolikwn-ipodomwn\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u0391\u03bd\u03ac\u03bb\u03c5\u03c3\u03b7 \u0394\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd: \u0397 \u03c7\u03c1\u03b7\u03bc\u03b1\u03c4\u03bf\u03b4\u03cc\u03c4\u03b7\u03c3\u03b7 \u03c4\u03c9\u03bd \u03c3\u03c7\u03bf\u03bb\u03b9\u03ba\u03ce\u03bd \u03c5\u03c0\u03bf\u03b4\u03bf\u03bc\u03ce\u03bd - Data Stories @ NewTech Lab\" \/>\n<meta property=\"og:description\" content=\"\u0397 \u03b5\u03be\u03ad\u03c4\u03b1\u03c3\u03b7 \u03c4\u03b7\u03c2 \u03c7\u03c1\u03b7\u03bc\u03b1\u03c4\u03bf\u03b4\u03cc\u03c4\u03b7\u03c3\u03b7\u03c2 \u03c4\u03c9\u03bd \u03c5\u03c0\u03bf\u03b4\u03bf\u03bc\u03ce\u03bd \u03c4\u03c9\u03bd \u03c3\u03c7\u03bf\u03bb\u03b9\u03ba\u03ce\u03bd \u03bc\u03bf\u03bd\u03ac\u03b4\u03c9\u03bd \u03c4\u03b7\u03c2 \u03c7\u03ce\u03c1\u03b1\u03c2 \u03b1\u03c0\u03cc \u03c4\u03bf \u03ba\u03c1\u03ac\u03c4\u03bf\u03c2.\" \/>\n<meta property=\"og:url\" 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name=\"twitter:data1\" content=\"Vasiliki Liggou\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/calypso.media.uoa.gr\/datastories\/analysi-dedomenw-h-xrhmatodothsh-twn-sxolikwn-ipodomwn\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/calypso.media.uoa.gr\/datastories\/analysi-dedomenw-h-xrhmatodothsh-twn-sxolikwn-ipodomwn\/\"},\"author\":{\"name\":\"Vasiliki Liggou\",\"@id\":\"https:\/\/calypso.media.uoa.gr\/datastories\/#\/schema\/person\/db1316b75e8f67b38325b6ec82ea1b7b\"},\"headline\":\"\u0391\u03bd\u03ac\u03bb\u03c5\u03c3\u03b7 \u0394\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd: \u0397 \u03c7\u03c1\u03b7\u03bc\u03b1\u03c4\u03bf\u03b4\u03cc\u03c4\u03b7\u03c3\u03b7 \u03c4\u03c9\u03bd \u03c3\u03c7\u03bf\u03bb\u03b9\u03ba\u03ce\u03bd 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