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| $(call to_n,4) = $(words ) $(if $(filter-out 4,$(words x )),$(call to_n,4,x )) # $1 == 4, $2 is blank | |
| = 0 $(if $(filter-out 4,1),$(call to_n,4,x )) # $(filter-out 4,1) is 1 | |
| = 0 $(if 1,$(call to_n,4,x )) # So the $(call) will happen | |
| = 0 $(call to_n,4,x ) | |
| = 0 $(words x ) $(if $(filter-out 4,$(words x x )),$(call to_n,4,x x )) | |
| = 0 1 $(if $(filter-out 4,2)),$(call to_n,4,x x )) # $(filter-out 4,2) is 2 | |
| = 0 1 $(if 2,$(call to_n,4,x x)) # So the $(call) will happen | |
| = 0 1 $(call to_n,4,x x) | |
| = 0 1 $(words x x ) $(if $(filter-out 4,$(words x x x)),$(call to_n,4,x x x )) | |
| = 0 1 2 $(if $(filter-out 4,3),$(call to_n,4,x x x )) # $(filter-out 4,3) is 3 | |
| = 0 1 2 $(if 3,$(call to_n,4, x x x )) # So the $(call) will happen | |
| = 0 1 2 $(call to_n,4,x x) | |
| = 0 1 2 $(words x x x ) $(if $(filter-out 4,$(words x x x x )),$(call to_n,4,x x x x )) | |
| = 0 1 2 3 $(if $(filter-out 4,4),$(call to_n,4,x x x x )) # $(filter-out 4,4) is | |
| = 0 1 2 3 # $(call) does not happen |
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