Assertion: jump | /r/AtLocation | a rocking-chairposition
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Source sentences:
text: The jumps were made in a "rocking-chair" position, descending on his back, rather than the usual arch familiar to skydivers, because he was wearing a 60-pound (27 kg) "kit" on his behind and his pressure suit naturally formed that shape when inflated, a shape appropriate for sitting in an airplane cockpit.