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equation
(
r:
Line
,{x:
Variable
, y:
Variable
}:
List
)
equation
(
r:
Line
)
equation
(
c:
Circumference
,{x:
Expression
,y:
Expression
}:
List
)
equation
(
c:
Circumference
)
equation
(
c:
Conic
,{x,y}:
List
)
equation
(
p:
Plane
,{x:
Variable
, y:
Variable
, z:
Variable
}:
List
)
equation
(
p:
Plane
)
xyz
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