Revert "add jumbo"
Revert "add jumbo"

This reverts commit 3f7c33901abb3bdd7f8ea69ecaff9e6386e210d1.

stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/math,stan-dev/math