My coach (who is a US Regional-level TS and receives clarifications constantly via email and goes to tech school at least 1X per year) understands the rule to be as BoP does - 5 and 3 in EACH direction - when constructing step sequences for her skaters.
In addition, here is the link to USFS for the rules (only because it's easier to find than the correct communication on ISU's page):
1) Minimum variety (Level 1), simple variety (Level 2), variety (Level 3), complexity (Level 4) of turns and steps throughout (compulsory)
2) Rotations (turns, steps) in either direction (left and right) with full body rotation covering at least 1/3 of the pattern in total for each rotational direction
3) Use of upper body movements for at least 1/3 of the pattern
4) Two different combinations of 3 difficult turns (rockers, counters, brackets, twizzles, loops) quickly executed with a clear rhythm within the sequence
With clarification below:
Types of turns (executed on one foot) : three turns, twizzles, brackets, loops, counters, rockers.
Types of steps (executed on one foot whenever possible) : toe steps, chasses, mohawks, choctaws, curves with change of edge, cross-rolls, running steps.
Minimum variety must include at least 5 turns & 2 steps, none of the types can be counted more than twice.
Simple variety must include at least 7 turns & 4 steps, none of the types can be counted more than twice.
Variety must include at least 9 turns and 4 steps, none of the types can be counted more than twice.
Complexity must include at least 5 different types of turns and 3 different types of steps all
executed at least once in both directions.
Use of upper body movements means the visible use for a combined total of at least 1/3 of the pattern of the step sequence any movements of the arms, head and torso that have an effect on the balance of the main body core.
Two combinations of difficult turns are considered to be the same if they consist of the same turns done in the same order, on the same edge and on the same foot.
Source:
http://www.usfsa.org/content/2013-14 Singles Levels of Difficulty.pdf