The following inlined images (igraphs) are originally by Google and are sourced from Noto Color Emoji font:

* ).png : https://github.com/googlefonts/noto-emoji/blob/master/svg/emoji_u1f642.svg (Slightly Smiling Face)
* (.png : https://github.com/googlefonts/noto-emoji/blob/master/svg/emoji_u2639.svg (Frowning Face)
* D.png : https://github.com/googlefonts/noto-emoji/blob/master/svg/emoji_u1f603.svg (Grinning Face)
* O.png : https://github.com/googlefonts/noto-emoji/blob/master/svg/emoji_u1f632.svg (Astonished Face)
* P.png : https://github.com/googlefonts/noto-emoji/blob/master/svg/emoji_u1f61b.svg (Face with Stuck-Out Tongue)
* blink_*.png : (Slightly Smiling Face) + https://github.com/googlefonts/noto-emoji/blob/master/svg/emoji_u1f609.svg (Winking Face)

See below for license to these files:
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Copyright 2013 Google, Inc. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

