I can access PF problem sets 4/5 and view the questions and printable versions of the questions, but when I open up the answer key and click explanation, there is a lock. That lock takes me to the LSAT Ultimate+ upgrade page. Are sets 4/5 Ultimate+ problem sets? Usually an Ultimate+ problem set is locked from the syllabus page. For instance, once I click into the PF Problem Set 4 page, I can click on the "Lesson12 of 13" link underneath the "Parallel Flaw Questions Problem Set 4" title which shows me that PF Problem Sets 6/7 are locked for me and that they require Ultimate+. So are 4/5/6/7 all Ultimate+ sets and for some reason I'm getting partial access to 4/5 or am I given access to 4/5 as a regular Ultimate member but for some reason getting locked out of the explanations because of a technical error?