O-uchi-gari into Ko-uchi-gari.

Combination (Renraku-waza).

Techniques
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1. O-uchi-gari (大内刈), the major inner reap.
2. Ko-uchi-gari (小内刈), the minor inner reap.

About
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Two reaps on opposite legs, and the second is set up entirely by the first. Escaping the major inner reap puts weight onto the other foot, which the minor inner reap then takes.

Step by step (standard right-handed form)
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1. Take your right grips and reap the inside of their left leg backwards with your right leg.
2. Feel them pull that leg clear and shift their weight onto their right foot.
3. Put your right foot down and keep driving their upper body backwards with your right hand.
4. Reap their right foot inwards with the sole of your right foot, sweeping across the mat.
5. Keep their chest travelling backwards so they cannot step out of it.
6. They sit down backwards; keep the sleeve and follow under control.

Receiving it
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Two reaps on opposite legs, and the first one is the reason the second works: saving your left leg puts every kilogram onto your right foot, and their sole takes it inwards across the mat before your weight can move again. You sit straight down. Keep your chin tucked, let the held arm stay long instead of posting behind you, and slap with your free arm as your back meets the mat.

Demonstrations
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British Judo: O-Uchi-Gari into Ko-Uchi-Gari https://www.youtube.com/watch?v=B8NIthXy9L0
Destination Judo: O-Uchi-Gari into Ko-Uchi-Gari https://vimeo.com/548837335
Mike Swain: 1:02:48 Ouchi-gari to Kouchi-gari https://www.youtube.com/watch?v=_cCAytbmk3g&t=3768s
Akita Judo: O-uchi-gari into Ko-uchi-gari https://www.youtube.com/watch?v=SAW5xtUZqdY
Akita Judo: O-uchi-gari into Ko-uchi-gari https://www.youtube.com/watch?v=D0OXkRy7bk8
Akita Judo: ouchigari into kouchigari https://www.youtube.com/watch?v=JYbijQo_6fw

VI judo notes
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Your reaping leg is the sensor: when their leg pulls clear you feel where their weight has gone, and it has gone onto the other foot. Put your foot down and reap across the mat with the sole rather than at the ankle with the toes. Keep driving their upper body backwards with your hand throughout, or they simply step out of the second attack as they did the first.

From Waza Book: https://wazabook.com/combinations/o-uchi-gari-into-ko-uchi-gari.txt