Jim didn't run as fast as Jack.
= Jim didn't run so fast as Jack.
= Jim ran more slowly than Jack.
= Jack ran faster than Jim.
= Jack didn't run as/so slowly as Jim.
Jim didn't run as fast as Jack.
= Jim didn't run so fast as Jack.
= Jim ran more slowly than Jack.
= Jack ran faster than Jim.
= Jack didn't run as/so slowly as Jim.