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The soldiers, swinging their arms and keeping time spontaneously, marched with long steps.
Its vapour is spontaneously inflammable when exposed to air.
Tumours appear to arise spontaneously, i.e.
These forms are developed spontaneously, without suggestion from outside.
His sermons especially abound in quotations and allusions, which have the air of spontaneously suggesting themselves, but which must sometimes have baffled his hearers.