HP -65 Owner's Handbook Manual page 98

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13.
14,
15.
16.
17.
Using
in a program and forgetting to initialize register
R, to the proper value.
Calculating f(x,y) with the operands reversed.
Losing program and data by inadvertently switching the cal-
culator off, by unplugging the battery charger, or by plug-
ging in the battery charger.
Causing improper return from a defined function because
multi-level nesting was attempted. Proper usage is as fol-
lows: a program can call a function but that function
must return control to the caller before another function
can be executed. See description of RTN in section 4.
Using [CLX to put zero into X only to have it overwritten by
a subsequent operation, because 1095 disables the stack
lift. Use [0] to put zero into X.

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