File: tget_element_in_structure.reference

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Does the Sollya object { .a = 5, .b = exp(_x_), .c = { .d = 17, .e = sin(_x_) } } contain an element called "a"? Yes. That element is 5.
Does the Sollya object exp(_x_) contain an element called "a"? No. 
Does the Sollya object { .a = 5, .b = exp(_x_), .c = { .d = 17, .e = sin(_x_) } } contain an element called "u"? No. 
Does the Sollya object { .a = 5, .b = exp(_x_), .c = { .d = 17, .e = sin(_x_) } } contain an element called "d"? No.