The is a rehearsal is when the actors and designs are all onstage for the first time in an attempt to coordinate all the elements with the performers, whereas the rehearsal is when all the design elements together with the full involvement of the actors are performed with

If the measure is suppose to have six beats and we need 1 note and 1 rest, we can either do a whole note with a half note rest after that since a whole note equals 4 beats and a half note rest equals 2 beats or we could do a whole note rest with a half note after that since a whole note rest is 4 beats and a half note is 2 beats