# C-first · Two cards share a key

An invented first collection names a star drawing SKY and a moon drawing also SKY. A SKY request returns both drawings. CLOUD returns no card because no card has that key. In a second collection only the moon key changes from SKY to MOON; the star remains SKY. SKY in the second returns only the star. The first complete collection is kept separately and is not removed.

Original neutral source illustration for C-first: Two cards share a key. Two complete version panels labelled First and Second at(25,90,285,260),(330,90,285,260). Each has two broad card rows separated at y220. First: star outline labelled SKY and moon crescent labelled SKY. Second: same star SKY and moon MOON. Short request labels SKY and CLOUD remain exact. A lower note says Both versions kept separately. The geometry changes only the supplied key; no invented item, physical activity or criterion/worked statement. Complete fictional source: An invented first collection names a star drawing SKY and a moon drawing also SKY. A SKY request returns both drawings. CLOUD returns no card because no card has that key. In a second collection only the moon key changes from SKY to MOON; the star remains SKY. SKY in the second returns only the star. The first complete collection is kept separately and is not removed. This is source material only; four own responses remain empty elsewhere. No staff criterion, worked response or next teaching is included.

## What does SKY return in the first collection?

[Empty response space]

## What does CLOUD return? Why?

[Empty response space]

## What changes in the second collection? What does SKY return then?

[Empty response space]

## Is the first collection still kept? Show why.

[Empty response space]

Read the exact source neutrally, reread, use broad pointing/card movement/usual communication or scribe exactly as directed. Record actual help and prompts. Do not supply a model, explain an answer or fill the four own spaces before an attempt. Pass, private response, pause or a smaller later offer remain valid.

These source responses do not alone prove actual device familiarity/use, an actual learner-owned contribution, calibrated QCAA bands or causal gains. Those are separately observed evidence.