25. Periods and Rites Inquiry Catechumenate Purification & Enlightenment Mystagogy Rite of Acceptance Rite of Welcome Rite of Election Scrutinies Easter Sacraments of Initiation
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28. An echo reproduces what it has received. It cannot create a new sound. The original sound must come from a different source.
29. If the wall is smooth, at the right angle, the right distance and with the correct shape, then the echo will reproduce the original sound faithfully.