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drop w -- core ``drop''
nip w1 w2 -- w2 core-ext ``nip''
dup w -- w w core ``dupe''
over w1 w2 -- w1 w2 w1 core ``over''
tuck w1 w2 -- w2 w1 w2 core-ext ``tuck''
swap w1 w2 -- w2 w1 core ``swap''
pick u -- w core-ext ``pick''
x0 ... xu u -- x0 ... xu x0 .
rot w1 w2 w3 -- w2 w3 w1 core ``rote''
-rot w1 w2 w3 -- w3 w1 w2 gforth ``not-rote''
?dup w -- w core ``question-dupe''
( w -- 0 | w w ). It performs a
dup if w is nonzero.
roll x0 x1 .. xn n -- x1 .. xn x0 core-ext ``roll''
2drop w1 w2 -- core ``two-drop''
2nip w1 w2 w3 w4 -- w3 w4 gforth ``two-nip''
2dup w1 w2 -- w1 w2 w1 w2 core ``two-dupe''
2over w1 w2 w3 w4 -- w1 w2 w3 w4 w1 w2 core ``two-over''
2tuck w1 w2 w3 w4 -- w3 w4 w1 w2 w3 w4 gforth ``two-tuck''
2swap w1 w2 w3 w4 -- w3 w4 w1 w2 core ``two-swap''
2rot w1 w2 w3 w4 w5 w6 -- w3 w4 w5 w6 w1 w2 double-ext ``two-rote''