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Hi, i have this ER daigram and I'm a little confused about the meaning of these symbols , can anyone tell me the meaning of

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Hi, i have this ER daigram and I'm a little confused about the meaning of these symbols , can anyone tell me the meaning of them?
ONLINE ART GALLERY MANAGEMENT SYSTEM e_type eid start date end_date location Exhibition Organise 3 name url(0) address Gallery location phone (0) Artist Have c_name Painted_by G cost address year painting Brought_By customer phone (0) o type have Emal kes liked login usertype password

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