Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

I-statement

"Some S are P."

An I statement is the particular affirmative categorical statement, "Some S are P": at least one member of the subject class is a member of the predicate class.

Examples

"Some birds are flightless."