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BEGIN: right after the delay (if any)
START: at each iteration beginning
END: at each iteration ending, before the repeat delay
COMPLETE: at last END event
BACK_BEGIN: at the beginning of the first backward iteration
BACK_START: at each backward iteration beginning, after the repeat delay
BACK_END: at each backward iteration ending
BACK_COMPLETE: at last BACK_END event
{@code
forward : BEGIN COMPLETE
forward : START END START END START END
|--------------[XXXXXXXXXX]------[XXXXXXXXXX]------[XXXXXXXXXX]
backward: bEND bSTART bEND bSTART bEND bSTART
backward: bCOMPLETE bBEGIN
}