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v.
cause to happen, occur or exist; "This procedure produces a curious effect"; "The new law gave rise to many complaints"; "These chemicals produce a noxious vapor"; "the new President must bring about a change in the health care system"
v.
reflect deeply on a subject; "I mulled over the events of the afternoon"; "philosophers have speculated on the question of God for thousands of years"; "The scientist must stop to observe and start to excogitate"
v.
talk over conjecturally, or review in an idle or casual way and with an element of doubt or without sufficient reason to reach a conclusion; "We were speculating whether the President had to resign after the scandal"
v.
reflect deeply on a subject; "I mulled over the events of the afternoon"; "philosophers have speculated on the question of God for thousands of years"; "The scientist must stop to observe and start to excogitate"