Considering Fig. 13-26, a Proposal has an association to Sending that is 1 to *{ordered} stack. Considering that this association is bidirectional, show the mutual-friends implementation of its representation and its methods.

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Cancellation +date: Date +reason: String 0..1 1 {ordered) < < < >>. Proposal 0..1 +status: Proposal Status ProposalStatus::waiting_changes < > < > +id: Proposalld Sismob.nextProposalld() +name: String < > +priority: Natural +validity: Date = Date.today+Sismob.proposal_validity() +/qualified_for_decision: Boolean 1 proposals */{ordered} proposals_by_deadline Sending {date < > +id: SendingID = Sismob.next_sending_number()| < > +date: Date = Sismob.today() < > +decision motivation: Motivation Text < > +final_status: DecisionType Modification +text: String 1 0..1 FundsAllocation 0..1 0..1 Funds Deallocation Publication sendings_received 0..1 id 0.01 municipal_manager id Controller Person proposals sent 1 +id: Personld +name: String +email: Email federal_manager id < > Decision Type approved 1 reviewer cancelled waiting_changes 0..1 assessments ProposalAssessment id < > < > < > +id: ProposalAssessmentid ProposalStatus assessments +text: String active +opinion: String PhaseCompletionRequisition 1 0.01 0..1 PhaseAssessment +concluded: Boolean = False waiting changes concluded cancelled < > MotivationText +text: String -validate()