# Separate answer key: constructed notes, not learner results

L1 incomplete authored note: “On 31 October the account has 1,200 followers and 90 October follows, so net growth is 90.” Unit/window appear, but arithmetic and unknowns fail the declared criteria: only 2/4 in this authored example. This is no competence percentage.

L1 revised note: “The 31 October snapshot is 1,200 followers. October has 90 recorded new follows. Unfollows are not supplied, so net growth and starting stock are unestablished.” All four stated criteria are represented in this authored example; this is not observed learning.

Two compatible hypothetical completions illustrate why: with no other adjustments, losses 0 imply start 1,110 and net +90; losses 40 imply start 1,150 and net +50. Both end at 1,200 with 90 gains. These are possible teaching histories, not estimates of missing actual values or probabilities.

L2: 1,000 + 90 − 30 = 1,060. Net +60; 60/1,000 × 100 = 6%. The fixture explicitly supplies complete same-account flows and no other adjustments; do not silently transfer those conditions to L1.

L3: 80/2,000 × 100 = 4%, events per impressions. Neither numerator nor denominator establishes distinct responding people. Preserve the unit and observation window.

Use actual criteria and sources to review your own text. The checker verifies only the supplied numerical fixture and declared flags. It cannot grade arbitrary prose, infer help used, certify ability or prove a training effect.