According to https://github.com/ReactiveX/rxjs/blob/master/docs_app/content/guide/testing/marble-testing.md#marble-syntax '--(abc)-|': on frame 20, emit a, b, a
android-variants
vgam
iddcx
textrank
lync-2013
wikimedia
http-host
email-notifications
pep
ldif
multi-index
triangular
stackedbarseries
laminas-api-tools
webpack-cli
shared-worker
django-3.2
debug-information
resource-files
uiswitch
end-of-line
consensus
hlint
react-native-hermes
word-count
contentpane
core-js
cvi
datepart
flutter-assetimage
