--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lazyBug.py	Mon Mar 09 17:39:38 2020 +0000
@@ -0,0 +1,15 @@
+'''Illustrate problem with writable cache in LazySubsequence'''
+
+from nltk.corpus import brown
+import nltk, sys
+
+data = brown.tagged_sents(categories='news', tagset='universal')
+train_data=data[:1000]
+y=train_data[0]
+print('initial:',y==train_data[0],train_data[0][:2])
+train_data[0].insert(0,('<s>','<s>'))
+print('modified:',y==train_data[0],train_data[0][:2])
+z=len([s for s in train_data])
+print('post-view:',y==train_data[0],train_data[0][:2])
+
+print("\nnltk: %s\npython: %s"%(nltk.version_info,sys.version))