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Help: (Typing pid⮐ into the input box displays the process ID if the websocket is operating.)
Four formats are accepted (however, they may not be mixed): for syntax/examples expand (collapse) numbered section below:
1: expand

Syntax: Examples 1-3: Examples 4 and 5: Example 6:

Syntax:	Examples 1-3:	Examples 4 and 5:	Example 6:
node = [label ␣terminal⁺ \| node^] Notes: ■ no space permitted between [ and label ■ ^ = zero or more occurrences ■ ⁺ = one or more occurrences ■\| = or ■ ␣ = space(s) ■ label and terminal should not contain spaces, square brackets, or double quotes (single quotes and round brackets are ok) Underscore (_), see examples 2, 4 and 6: ■ _word = ~~word~~ ■ word1_word2 = word1_word2 ■ _ = ␣ (blank) ■ _N_ = ␣ (blank N characters long)	`[a[b][c d]]` `[a [b][_]]` label `_` is a zero-length blank. `[a [b]]`	`[Adv by and large]` by and large is a multi-word terminal. when k>1 in terminal^k, a triangle is drawn. cf. `[Adv [by][and][large]]`	`[<ɸ,ɸ>[DP_i 香港][T[T][v[_DP_i _香港][v[v*][β _10_ _]]]]]` 香港 is a single word. `β` dominates an empty multi-word consisting of `_10_` (= a 10 character blank) plus `_` (= a zero-length blank).

node = [label ␣terminal⁺ | node^*]
Notes:
■ no space permitted between [ and label
■ ^* = zero or more occurrences
■ ⁺ = one or more occurrences
■| = or
■ ␣ = space(s)
■ label and terminal should not contain spaces, square brackets, or double quotes (single quotes and round brackets are ok)
Underscore (_), see examples 2, 4 and 6:
■ _word = ~~word~~
■ word1_word2 = word1_word2
■ _ = ␣ (blank)
■ _N_ = ␣ (blank N characters long)

[a[b][c d]]

[a [b][_]]

label _ is a zero-length blank.

[a [b]]

[Adv by and large]

by and large is a multi-word terminal.
when k>1 in terminal^k, a triangle is drawn.

cf. [Adv [by][and][large]]

[<ɸ,ɸ>[DP_i 香港][T[T][v*[_DP_i _香港][v*[v*][β _10_ _]]]]]

香港 is a single word.
β dominates an empty multi-word consisting of _10_ (= a 10 character blank) plus _ (= a zero-length blank).

2: expand

Syntax:	Examples 1-3:	Examples 4:
node = {(label ␣) node node} \| <node node> \| terminal Notes: ■{α,β} for set Merge, see example 1 ■ <α,β> for pair Merge, α adjunct; connection always made to non-adjunct β, see examples 2 and 3 ■ set Merge label is optional ■ if present, see example 4, no space permitted between { and label, and ■ there must be at least one space (␣) following label ■\| = or ■ ␣ = space(s) ■ label and terminal should not contain spaces, angle or curly braces, or single double quotes (paired double quotes, "..." (see example 3), single quotes, round and square brackets are ok) Underscore (_), see example 3 (and help section 1 above): ■ _word = ~~word~~ ■ word1_word2 = word1_word2 ■ _ = ␣ (blank) ■ _N_ = ␣ (blank N characters long)	`{x,{y,z}}` `{<y,zp>,x}` `{x,<y,zp>}`	`{(<ɸ,ɸ>) XP,{T,{v* _XP,{v* v*,β}}}}`

3: expand

Prolog term format.
node = label(node,.., node | terminal | terminals)
terminals = [terminal,.., terminal]
Examples:

a(b) a([b]) np([a,good,thought]) s(np(prp(he)), vp(vbd(yawned), np(dt(a), jj(good), nn(yawn))))

4: expand

Penn Treebank-style Lisp S-EXPs, with similar options to format #1.
Note: does not permit unlabeled nodes, e.g. ((S)), cf. (S).

(a b)

(a (b)) (a one _two three) (S (NP-SBJ (NP (NNP Pierre) (NNP Vinken)) (, ,) (ADJP (NP (CD 61) (NNS years)) (JJ old)) (, ,) ) (VP (MD will) (VP (VB join) (NP (DT the) (NN board)) (PP-CLR (IN as) (NP (DT a) (JJ nonexecutive) (NN director))) (NP-TMP (NNP Nov.) (CD 29)))) (. .))