Update examples.

README.md

@@ -19,9 +19,9 @@ cargo install --git https://github.com/sebpuetz/lumberjack
 * Convert treebank in NEGRA export 4 format to bracketed TueBa V2 format
 ```bash
 lumberjack-conversion --input_file treebank.negra --input_format negra \
-    --output_format tueba --output_file treebank.filtered
+    --output_format tueba --output_file treebank.tueba --projectivize
 ``` 
-* Retain only root node, NPs and VPs and print to simple bracketed format:
+* Retain only root node, `NP`s and `PP`s and print to simple bracketed format:
 ```bash
 echo "NP PP" > filter_set.txt
 lumberjack-conversion --input_file treebank.simple --input_format simple \
@@ -34,6 +34,25 @@ parent tags of terminals as features.
 lumberjack-conversion --input_file treebank.simple --input_format  simple\
     --output_format conllx --output_file treebank.conll --parent 
 ```
+* Modifications in the following order:
+
+1. Reattach all terminals with part-of-speech starting with `$` to the
+root node
+2. Remove all nonterminals except the root, `S`s, `NP`s, `PP`s and `VP`s
+3. Assign unique identifiers based on the closest `S` to terminals
+4. Insert nodes with label `label` above terminals that aren't dominated by `NP` or `PP`
+5. Annotate label of parent node on terminals.
+6. Print to CONLLX format with annotations.
+
+```bash
+echo "S VP NP PP" > filter_set.txt
+echo "NP PP" > insert_set.txt
+echo "S" > id_set.txt
+lumberjack-conversion --input_file treebank.simple --input_format simple\
+    --output_format conllx --insertion_set insert_set.txt \
+    --insertion_label label --id_set id_set.txt --reattach $\
+    --parent parent --output_file treebank.conllx
+```
 
 ## Usage as rust library:
 * read and projectivize trees from NEGRA format and print to simple
@@ -57,11 +76,11 @@ fn print_negra(path: &str) {
 * filter non-terminal nodes from trees in a treebank and print to
  simple bracketed format:
 ```rust
-use lumberjack::{io::PTBFormat, TreeOps, util::LabelSet};
+use lumberjack::{io::PTBFormat, Tree, TreeOps, util::LabelSet};
 
 fn filter_nodes(iter: impl Iterator<Item=Tree>, set: LabelSet) {
     for mut tree in iter {
-        tree.filter_nonterminals(&set).unwrap();
+        tree.filter_nonterminals(|tree, nt| set.matches(tree[nt].label())).unwrap();
         println!("{}", PTBFormat::Simple.tree_to_string(&tree).unwrap());
     }
 }
@@ -71,7 +90,7 @@ encoded in the features field
 ```rust
 use conllx::graph::Sentence;
 use lumberjack::io::Encode;
-use lumberjack::TreeOps;
+use lumberjack::{Tree, TreeOps, UnaryChains};
 
 fn to_conllx(iter: impl Iterator<Item=Tree>) {
     for mut tree in iter {