"of many" – "of" stays, "many" numerous.
Need to make sure not to use the spintax for entire phrases unless necessary. The user specified "modify every word with 3 synonyms in spintax", so each word should be replaced, not phrases.
First, the original text starts with "Rottweilers". According to the spintax options, "Rottweilers" can be spun as German Shepherd. So I'll replace that first instance.
Код действителен в течение 3 дней