Rumelhart (1986)

https://gyazo.com/92350f314bea03a885ad8bb22fb3287c

https://gyazo.com/daf0f8145e01f39e12962485e2d08e0a

https://gyazo.com/6fd2a743c9593abc8d3c07857d14d8c6

https://gyazo.com/a85f38059dd79e448463b7201f79bf61