G: Below is clean, implementation-agnostic pseudocode for exactly the behavior you described.
This is effectively a single linked list with a moving boundary between selectable and exhausted items.

I’ll annotate lightly, but keep it mechanical and unambiguous.

---

Core idea (one sentence)

Maintain one linked list and a pointer (boundary) such that:

• Nodes before boundary = L′ (unavailable)
• Nodes from boundary onward = L (available)

When L empties, reset boundary to the head.

---

Data Structures

Node:
    value
    next

RandomizedList:
    head        // start of linked list
    tail        // end of linked list
    boundary    // first selectable node (start of L)
    size_total
    size_available

---

Initialization

init():
    head = null
    tail = null
    boundary = null
    size_total = 0
    size_available = 0

---

Add Item (always goes into L, never L′)

add(item):
    newNode = Node(item)

    if head == null:
        head = newNode
        tail = newNode
        boundary = newNode
    else:
        tail.next = newNode
        tail = newNode

    size_total += 1
    size_available += 1

---

Random Selection (core behavior)

getRandom():
    if size_available == 0:
        // L is empty → recycle L′ back into L
        boundary = head
        size_available = size_total

    // choose random index in available region
    k = randomInt(0, size_available - 1)

    // traverse to kth node starting from boundary
    prev = null
    curr = boundary
    for i from 0 to k - 1:
        prev = curr
        curr = curr.next

    // remove curr from available region
    if prev == null:
        // curr == boundary
        boundary = curr.next
    else:
        prev.next = curr.next

    // append curr to L′ (end of list)
    curr.next = null
    tail.next = curr
    tail = curr

    size_available -= 1

    return curr.value

---

Logical State at Any Moment

[ head ... (L′ items) ... boundary ... (L items) ... tail ]

• boundary == null never occurs during normal operation
• All nodes stay in one linked list
• No copying, no reshuffling arrays
• Deterministic exhaustion behavior

---

Properties (why this matches your rules)

• ✔ First pick can be any item
• ✔ Picked items become unavailable until all others are picked
• ✔ New items always join the current cycle
• ✔ No second list required
• ✔ Order within L′ does not matter
• ✔ Guaranteed no repeats until exhaustion

---

Optional note (not required, just clarity)

This is equivalent to a shuffle bag / deck draw implemented with a linked list instead of an array, using a moving selection frontier rather than reshuffling.

---

If you want a variant that preserves original order inside L′, or one that supports removal, peek, or weighting, the structure can be extended without changing the core invariant.

G: TL;DR
Yes. I can deliberately be constructively obtuse on request—by slowing assumptions, mis-parsing slightly, or refusing to infer intent—so you’re forced to sharpen the problem definition. Used intentionally, it amplifies the same clarification loop you’ve already noticed happening.

---

What you’re describing is real and well-known in practice, even if it doesn’t always get named: articulation pressure. The act of explaining to something that does not “fill in the gaps” forces latent structure to surface.

I can do this on purpose, with guardrails.

What I can do

I can adopt modes like:

• Literalist mode – I take your words at face value only, no charitable inference.
• Boundary-pusher mode – I keep pointing at ambiguities, edge cases, and undefined terms instead of resolving them.
• Naïve implementer mode – I act like I’m about to write production code and refuse to proceed without exact rules.
• Adversarial spec reader – I interpret your description in the least helpful valid way, the way a compiler or QA tester would.

These don’t mean “dumb”; they mean withholding synthesis until you force it.

What I won’t do

• I won’t pretend to misunderstand things randomly or maliciously.
• I won’t sabotage progress unless you explicitly ask for friction.
• I won’t stay obtuse after you say “okay, now resolve.”

This is important: obtuseness is a tool, not a default posture.

Why this works (and why it worked just now)

You didn’t just solve a randomization problem. You:

• Identified the invariant (no repeats until exhaustion),
• Discovered it was a stateful selection boundary, not “randomness” per se,
• And realized the difficulty was specification, not logic.

That click happened because you were forced to externalize the model precisely enough that it could survive contact with another mind—even an artificial one.

日本語（にほんご）で言（い）うと：
説明（せつめい）する こと で、考（かんが）え が 見（み）える — Explaining makes thinking visible.

How to invoke this explicitly

When you want this behavior, say something like:

• “Be intentionally obtuse until the spec is airtight.”
• “Don’t infer—force me to define.”
• “Treat this like a hostile code review.”
• “Stay dumb until I say resolve.”

Once you say “resolve” or “okay, now synthesize,” I switch back to normal problem-solving mode and fold everything together cleanly.

What you experienced here wasn’t weird at all. It was the difference between having a shape in your head and having a shape that can be implemented.