Exam question 4 · Olympiad: thinking like a machine, Bebras puzzles ★★★
Identify the next term of the sequence 2, 5, 11, 23, ..., in which each term is formed by doubling the previous term and adding one.
Mova's choice: option 1 · The right answer: option 3 · wrong ✗ · Who acts: you · What happens: identify, form, double, add, term · To what, where: next term, term, previous term, one, sequence
This is exam question 4 of lesson 31 «Olympiad: thinking like a machine, Bebras puzzles ★★★» of the AI course of Mova's primary school, asked in stiff, formal language. The page gives the question's syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause, then the 4 options as the student saw them, each with its tree and pragmatics. Every text is parsed by Mova itself. How the student answered it, with the score of every option and why: the test at school.
The question
The words, one row each (CoNLL-U)
| # | word | lemma | UPOS | features | head | relation |
|---|---|---|---|---|---|---|
| 1 | Identify | identify | VERB | Mood=Imp VerbForm=Fin | root | root |
| 2 | the | the | DET | Definite=Def PronType=Art | 4 term | det |
| 3 | next | next | ADJ | Degree=Pos | 4 term | amod |
| 4 | term | term | NOUN | Number=Sing | 1 Identify | obj |
| 5 | of | of | ADP | _ | 7 sequence | case |
| 6 | the | the | DET | Definite=Def PronType=Art | 7 sequence | det |
| 7 | sequence | sequence | NOUN | Number=Sing | 4 term | nmod |
| 8 | 2 | 2 | NUM | NumForm=Digit NumType=Card | 7 sequence | flat |
| 9 | , | , | PUNCT | _ | 10 5 | punct |
| 10 | 5 | 5 | NUM | NumForm=Digit NumType=Card | 8 2 | conj |
| 11 | , | , | PUNCT | _ | 12 11 | punct |
| 12 | 11 | 11 | NUM | NumForm=Digit NumType=Card | 8 2 | nmod |
| 13 | , | , | PUNCT | _ | 14 23 | punct |
| 14 | 23 | 23 | NUM | NumForm=Digit NumType=Card | 12 11 | conj |
| 15 | , | , | PUNCT | _ | 23 formed | punct |
| 16 | ... | ... | PUNCT | _ | 23 formed | punct |
| 17 | , | , | PUNCT | _ | 23 formed | punct |
| 18 | in | in | ADP | _ | 19 which | case |
| 19 | which | which | PRON | PronType=Rel | 23 formed | obl |
| 20 | each | each | DET | PronType=Tot | 21 term | det |
| 21 | term | term | NOUN | Number=Sing | 23 formed | nsubj:pass |
| 22 | is | be | AUX | Mood=Ind Number=Sing Person=3 Tense=Pres VerbForm=Fin | 23 formed | aux:pass |
| 23 | formed | form | VERB | Tense=Past VerbForm=Part Voice=Pass | 1 Identify | advcl |
| 24 | by | by | SCONJ | _ | 25 doubling | mark |
| 25 | doubling | double | VERB | Tense=Pres VerbForm=Part | 23 formed | advcl |
| 26 | the | the | DET | Definite=Def PronType=Art | 28 term | det |
| 27 | previous | previous | ADJ | Degree=Pos | 28 term | amod |
| 28 | term | term | NOUN | Number=Sing | 25 doubling | obj |
| 29 | and | and | CCONJ | _ | 30 adding | cc |
| 30 | adding | add | VERB | Tense=Pres VerbForm=Part | 25 doubling | conj |
| 31 | one | one | NUM | NumForm=Word NumType=Card | 30 adding | obj |
| 32 | . | . | PUNCT | _ | 1 Identify | punct |
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
|---|---|---|---|---|---|---|---|---|---|
| 1 | identify | imperative | you not said here | the next term of the sequence | vn characterize-29.2-1-1 «NP V NP S_ING»: agent=Agent term=Theme | ||||
| 2 | form | present · passive | each term | vn appear-48.1.1 «PP.location V NP»: subject=Theme | |||||
| 3 | double | gerund | the previous term | vn other_cos-45.4 «NP V NP.patient»: agent=Agent term=Patient | |||||
| 4 | add speech: assert | gerund | one | vn mix-22.1-2 «NP V NP»: agent=Agent one=Patient | |||||
| 5 | term | the sequence | nom term «communication transitive»: of=patient |
One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree.
The options
Option 1 · ← Mova's choice
46
The words, one row each (CoNLL-U)
| # | word | lemma | UPOS | features | head | relation |
|---|---|---|---|---|---|---|
| 1 | 46 | 46 | NUM | NumForm=Digit NumType=Card | root | root |
The frames reader finds no event or fact in this sentence.
Option 2
35
The words, one row each (CoNLL-U)
| # | word | lemma | UPOS | features | head | relation |
|---|---|---|---|---|---|---|
| 1 | 35 | 35 | NUM | NumForm=Digit NumType=Card | root | root |
The frames reader finds no event or fact in this sentence.
Option 3 · ✓ the right answer
47
The words, one row each (CoNLL-U)
| # | word | lemma | UPOS | features | head | relation |
|---|---|---|---|---|---|---|
| 1 | 47 | 47 | NUM | NumForm=Digit NumType=Card | root | root |
The frames reader finds no event or fact in this sentence.
Option 4
45
The words, one row each (CoNLL-U)
| # | word | lemma | UPOS | features | head | relation |
|---|---|---|---|---|---|---|
| 1 | 45 | 45 | NUM | NumForm=Digit NumType=Card | root | root |
The frames reader finds no event or fact in this sentence.
Text: the tests of Mova's primary school, written for Mova (world/data/school/), as the course runner gave them to the student. Trees: Mova's own parse — the en model on the CPU, when the site is built — not checked by a teacher; they may be wrong. Frames: Mova's frames reader (prag), each text read on its own. Elamur Cosmic License.
This page in Markdown → https://md.mova.elamur.ai/free/en/corpora/questions/ai/31-olympiad-thinking-like-a-machine/e4/