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*''For a more comprehensive list of construction recipes and rates, please see [https://db.kcwiki.org/construction PoiDB's construction page].
 
*''For a more comprehensive list of construction recipes and rates, please see [https://db.kcwiki.org/construction PoiDB's construction page].
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Constructing a girl costs [[Resources]]. It will also take time unless instant constructions {{IC}} are used.  
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Constructing a girl costs a selectable amount of the 4 main [[Resources]] as well as "development materials" {{DM}}. It will also take a variable amount of time unless instant constructions {{IC}} are used.  
* Every player starts off with only '''2 construction slots'''. Up to 2 more slots can be unlocked by using a '''[[Dock Opening Key]]''' each time.  
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* Every player starts off with only '''2 construction slots'''. Up to 2 more slots can be unlocked by using a '''[[Dock Opening Key]]''' for each.  
    
=Construction Types=
 
=Construction Types=
===Normal Construction===
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==Normal Construction==
 
'''"Normal Construction"''' is the basic construction method. Recipes range from 30-999 fuel {{Fuel}}, ammo {{Ammo}}, steel {{Steel}} and bauxite {{Bauxite}} and each attempt costs 1 development material {{DM}}. Speeding up construction costs 1 instant construction {{IC}}.
 
'''"Normal Construction"''' is the basic construction method. Recipes range from 30-999 fuel {{Fuel}}, ammo {{Ammo}}, steel {{Steel}} and bauxite {{Bauxite}} and each attempt costs 1 development material {{DM}}. Speeding up construction costs 1 instant construction {{IC}}.
*Construction results are solely determined by the amount of resources used.
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*If applicable, it is often more resource efficient to find a desired ship in sorties as a drop rather than building them.
**The HQ level or the Secretary used do not affect the building result (except for [[Z1]] & [[Z3]]).
     −
If applicable, it is often more resource efficient to find a desired ship in sorties as a drop rather than building them.
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===Construction Theory===
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In normal construction, there are 4 pools determining the ship being crafted. Each group has exactly 100 unique ships and the available pools remain the same '''regardless of which Secretary used''' (excepted for the {{Class|Z1}}).
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The selection of a pool is based on the resource input during the construction:
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*Pool 1 - 300+ {{Fuel}}, 400+ {{Steel}}, 300+ {{Bauxite}},
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*Pool 2 - 400+ {{Fuel}}, 600+ {{Steel}},
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*Pool 3 - 250+ {{Fuel}}, 200+ {{Steel}},
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*Pool 4 - Do not meet any of the above requirements.
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*Note: The check is done from top to bottom, if the requirements of multiple pools are fulfilled, only the topmost one is used.
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===Large Ship Construction===
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The constructed ship is selected in the pool by a value we call <math>ID</math> which can go from 1 to 100. It is calculated by substating two random value <math>Rand_1</math> and <math>Rand_2</math>.
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{|class="wikitable mw-collapsible mw-collapsed" width="100%"
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!colspan=2|<math>ID</math> Calculation
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|-
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|
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{|style="padding:10px; margin:20px; border:1px solid orange; border-radius:10px"
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|valign="center"|  <math>ID=Rand_1-Rand_2</math>
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|}
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;With
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*<math>Rand_1</math> a random number between 0 and 100,
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*<math>Rand_2</math> a random number generated between 0 and <math>Res-1</math>.
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In case value ID becomes 0 or negative, the value will be converted back into a positive value and incremented by 2:
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|-
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|
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;Note
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Every random function here give a random whole number between ''A'' and ''B'' with ''A'' and ''B'' included
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|-
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|
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Which resources that are used to increment value <math>Res</math> is dependent on the pool that has been selected:
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*Pool 1: {{Steel}} {{Bauxite}}
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{|style="padding:10px; margin:20px; border:1px solid orange; border-radius:10px"
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|valign="center"|  <math>Res=MAX \Bigg( abs \Big( \Bigg\lceil \frac{Steel-400}{25} \Bigg\rceil + \Bigg\lceil \frac{Baux-300}{20} \Bigg\rceil \Big); 51\Bigg)</math>
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|}
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 +
 
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*Pool 2: {{Ammo}} {{Steel}}
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{|style="padding:10px; margin:20px; border:1px solid orange; border-radius:10px"
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|valign="center"|  <math>Res=MAX \Bigg( abs \Big( \Bigg\lceil \frac{abs(Ammo-400)}{25} \Bigg\rceil + \Bigg\lceil \frac{abs(Steel-600)}{30} \Bigg\rceil \Big); 51\Bigg)</math>
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|}
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 +
 
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*Pool 3: {{Ammo}} {{Steel}}
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{|style="padding:10px; margin:20px; border:1px solid orange; border-radius:10px"
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|valign="center"|  <math>Res=MAX \Bigg( abs \Big( \Bigg\lceil \frac{abs(Ammo-200)}{13} \Bigg\rceil + \Bigg\lceil \frac{abs(Steel-200)}{20} \Bigg\rceil \Big); 51\Bigg)</math>
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|}
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*Pool 4: {{Fuel}} {{Steel}}
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{|style="padding:10px; margin:20px; border:1px solid orange; border-radius:10px"
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|valign="center"|  <math>Res=MAX \Bigg( abs \Big( \Bigg\lceil \frac{abs(Fuel-100)}{10} \Bigg\rceil + \Bigg\lceil \frac{abs(Steel-30)}{15} \Bigg\rceil \Big); 51\Bigg)</math>
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|}
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;With
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*<math>Res</math> a number that can be incremented by having low/high resource inputs of certain types,
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**51 is its maximum possible value.
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**The resources used to increment this value depend on the pool that has been selected.
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*<math>\lceil x \rceil</math> is the function ceiling which round decimals upwards
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*<math>abs</math> is the function absolute, which always return the number positive.
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[https://tsundb.kc3.moe/construction]
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|}
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;Pratical conclusion
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* Only 2 resource will have an effect depending of the pool. Changing the two other will ahve no effect as long as it doesn't change the pool.
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* On the two resource that have an effect one have a bigger effect than the other.
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** the effect is capped, above a certain threshold increasing the resources further won't have any effect.
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* The effect of changing resources will increase the drop of some ship by reducing the drop of others.
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 +
==Large Ship Construction==
 
'''"Large Ship Construction" (LSC)''' allows to build rarer "bigger" ships in exchange for more resources. Recipes range from 1500-7000 fuel {{Fuel}} and ammo {{Ammo}}; 2000-7000 steel {{Steel}} and 1000-7000 bauxite {{Bauxite}}. Each attempt also costs either 1, 20, or 100 development materials {{DM}}. Speeding up construction costs 10 instant construction {{IC}}.
 
'''"Large Ship Construction" (LSC)''' allows to build rarer "bigger" ships in exchange for more resources. Recipes range from 1500-7000 fuel {{Fuel}} and ammo {{Ammo}}; 2000-7000 steel {{Steel}} and 1000-7000 bauxite {{Bauxite}}. Each attempt also costs either 1, 20, or 100 development materials {{DM}}. Speeding up construction costs 10 instant construction {{IC}}.
 
*LSC is unlocked by completing quest {{Q|F10}}.
 
*LSC is unlocked by completing quest {{Q|F10}}.
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**For few ships, an exact Secretary is required in order to be built, see ''[[#Special Secretary|below]]''.
 
**For few ships, an exact Secretary is required in order to be built, see ''[[#Special Secretary|below]]''.
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=Special Secretary=
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==Special Secretary==
 
Some ships require a specific Secretary (1st fleet flagship) in order to be crafted.
 
Some ships require a specific Secretary (1st fleet flagship) in order to be crafted.
 
*For any other construction, the Secretary is independent of the crafting result.
 
*For any other construction, the Secretary is independent of the crafting result.
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