Lesson 07 of 12

Recap: Validity rules

Checklist of structural points from this lesson.

• Signs alternate in the written order.
• Letter order is PJJP or JPPJ — not strict PJPJ.
• Positions 1 and 2 are one perceiving (N/S) and one judging (T/F) letter; position 3 is the other letter of position 2’s kind; position 4 is the other letter of position 1’s kind.
• One function per quadrant — exactly the 16 standard stacks.

Exercise answer

Which CLO is invalid?

−850N +650S −450T +250F

−850N +650S −450T +250F is not PJJP or JPPJ. (−N +T −S +F is also invalid: Ni and Si would share a quadrant.)